Extension:AbuseFilter/Rules format/da

The rules are a custom language. They are formatted similar to conditionals in a C/Java/Perl-like language.

Strenge

You can specify a literal by placing it in single or double quotes (for strings), or by typing it in as-is (for numbers, both floating-point and integer). You can get linebreaks with \n, tab characters with \t, and you can also escape the quote character with a backslash.

Use the + (plus) symbol to concatenate two literal strings or the values of two vars with a string value.

Eksempler

"Dette er en streng"
'Dette er også en streng'
'This string shouldn\'t fail'
"This string\nHas a linebreak"
1234
1.234
-123

User-defined variables

You can define custom variables for ease of understanding with the assign symbol := in a line (closed by ;) within a condition. Such variables may use letters, underscores, and numbers (apart from the first character) and are case-insensitive. Eksempel (fra w:Special:AbuseFilter/79):

(
	line1:="(\{\{(r|R)eflist|\{\{(r|R)efs|<references\s?/>|</references\s?>)";
	rcount(line1, removed_lines)
) > (
	rcount(line1, added_lines)
)

Arrays

AbuseFilter has support for non-associative arrays, which can be used like in the following examples.

Forsigtig:

Expressions like page_namespace in [14, 15] may not work as expected. This one will evaluate to true also if page_namespace is 1, 4, or 5. For more information and possible workarounds, please see T181024.

my_array := [ 5, 6, 7, 10 ];
my_array[0] == 5
length(my_array) == 4
int( my_array ) === 4 // Samme som længde
float( my_array ) === 4.0 // Tæller som elementer
string(my_array) == "5\n6\n7\n10\n" // Note: the last linebreak could be removed in the future
5 in my_array == true
'5' in my_array == true
'5\n6' in my_array == true // Note: this is due to how arrays are casted to string, i.e. by imploding them with linebreaks
1 in my_array == true // Note: this happens because 'in' casts arguments to strings, so the 1 is caught in '10' and returns true.
my_array[] := 57; // This appends an element at the end of the array
my_array === [ 5, 6, 7, 10, 57 ]
my_array[2] := 42; // And this is for changing an element in the array
my_array === [ 5, 6, 42, 10, 57 ]

Kommentarer

Du kan specificere kommentarer ved at bruge følgende syntaks:

/* Dette er en kommentar */

Arithmetic

You can use basic arithmetic symbols to do arithmetic on variables and literals with the following syntax:

• - – Subtract the right-hand operand from the left-hand operand.
• + – Add the right-hand operand to the left-hand operand.
• * – Multiply the left-hand operand by the right-hand operand.
• / – Divide the left-hand operand by the right-hand operand.
• ** – Raise the left-hand operand to the exponential power specified by the right-hand operand.
• % – Return the remainder given when the left-hand operand is divided by the right-hand operand.

The type of the returned result is the same that would be returned by PHP, for which a lot of documentation may be found online. More exhaustive examples may be found in this AF parser test.

Eksempel	Resultat
1 + 1	2
2 * 2	4
1 / 2	0.5
9 ** 2	81
6 % 5	1

Boolean operations

You can match if and only if all of a number of conditions are true, one of a number of conditions are true, or one and only one of all conditions are true.

• x | y — OR – returns true if one or more of the conditions is true.

• x & y — AND – returns true if both of the conditions are true.

• x ^ y — XOR – returns true if one, and only one of the two conditions is true.

• !x — NOT – returns true if the condition is not true.

Eksempler

Kode	Resultat
1 | 1	true
1 | 0	true
0 | 0	false
1 & 1	true
1 & 0	false
0 & 0	false
1 ^ 1	false
1 ^ 0	true
0 ^ 0	false
!1	false
!0	true

Simple comparisons

You can compare variables with other variables and literals with the following syntax:

• <, > – Return true if the left-hand operand is less than/greater than the right-hand operand respectively. Watch out: operands are casted to strings and, like it happens in PHP, null < any number === true and null > any number === false.
• <=, >= – Return true if the left-hand operand is less than or equal to/greater than or equal to the right-hand operand respectively. Watch out: operands are casted to strings and, like it happens in PHP, null <= any number === true and null >= any number === false.

• == (or =), != – Return true if the left-hand operand is equal to/not equal to the right-hand operand respectively.

• ===, !== – Return true if the left-hand operand is equal to/not equal to the right-hand operand AND the left-hand operand is the same/not the same data type to the right-hand operand respectively.

Eksempel	Resultat
1 == 2	false
1 <= 2	true
1 >= 2	false
1 != 2	true
1 < 2	true
1 > 2	false
2 = 2	true
'' == false	true
'' === false	false
1 == true	true
1 === true	false
['1','2','3'] == ['1','2','3']	true
[1,2,3] === [1,2,3]	true
['1','2','3'] == [1,2,3]	true
['1','2','3'] === [1,2,3]	false
[1,1,''] == [true, true, false]	true
[] == false & [] == null	true
['1'] == '1'	false

Indbyggede variabler

The abuse filter passes various variables by name into the parser. These variables can be accessed by typing their name in, in a place where a literal would work. You can view the variables associated with each request in the abuse log.

Variables from AbuseFilter

Tilgængelige variabler

Forsigtig:

User-related variables are always available, except for one case: account creation when the creator is not logged in. Alle variabler der starter med user_ påvirkes.

Beskrivelse	Navn	Datatype	Bemærkninger
Handling	action	streng	En af følgende: edit, move, createaccount, autocreateaccount, delete, upload, stashupload
Unix timestamp of change	timestamp	streng	int(timestamp) gives you a number with which you can calculate the date, time, day of week, etc.
Databasenavnet til wikien	wiki_name	streng	For instance, this is "enwiki" on the English Wikipedia, and "itwikiquote" on the Italian Wikiquote.
Sprogkoden for wikien	wiki_language	streng	For instance, this is "en" on the English Wikipedia, and "it" on the Italian Wikiquote. Multi-lingual wikis like Commons, Meta, and Wikidata will also report as "en".
Brugerens redigeringsantal	user_editcount	integer/null	Null only for unregistered users.
Brugerkontoens navn (IP in case the user is not registered)	user_name	streng	For "createaccount" and "autocreateaccount" actions, use accountname if you want the name of the account being created. Forsigtig: On wikis where temporary accounts are enabled, IPs are not returned for unregistered users. Use user_unnamed_ip instead if the IP is needed. More context is available here .
Type of the user account ($1)	user_type	string	The type of the user, which will be one of ip, temp (if the user is using a temporary account ), named, external, or unknown.
Tidspunkt e-mailadressen blev bekræftet	user_emailconfirm	string/null	In the format: YYYYMMDDHHMMSS. Null if the email wasn't confirmed.
Brugerkontoens alder	user_age	integer	In seconds. 0 for uregistrede brugere.
Hvorvidt brugeren er blokeret	user_blocked	boolean	True for blocked registered users. Also true for edits from blocked IP addresses, even if the editor is a registered user who is not blocked. False otherwise. This doesn't differentiate between partial and sitewide blocks.
Grupper (heriblandt implicitte) som brugeren er i	user_groups	array of strings	se Special:ListGroupRights
Rettigheder som en bruger har	user_rights	array of strings	se Special:ListGroupRights
Side-ID	article_articleid	integer	(forældet) Brug page_id i stedet.
Side-ID (can be seen via "page information" link in sidebar)	page_id	integer	This is 0 for new pages, but it is unreliable when inspecting past hits. If you need an exact result when inspecting past hits, use "page_age == 0" to identify new page creation. (note that it is slower, though.) This issue has been fixed in 9369d08, merged on September 11th 2023.
Sidens navnerum	article_namespace	integer	(forældet) Brug page_namespace i stedet.
Sidens navnerum	page_namespace	integer	refers to namespace index . Check for namespace(s) using expressions like "page_namespace == 2" or "equals_to_any(page_namespace, 1, 3)"
Sidens alder (i sekunder)	page_age	integer	the number of seconds since the first edit (or 0 for new pages). This is reliable, but it tends to be slow; consider using page_id if you don't need much precision.
Sidetitel (uden navnerum)	article_text	streng	(forældet) Brug page_title i stedet.
Sidetitel (uden navnerum)	page_title	streng
Fuld sidetitel	article_prefixedtext	streng	(forældet) Brug page_prefixedtitle i stedet.
Fuld sidetitel	page_prefixedtitle	streng
Beskyttelsesniveau for redigering af siden	article_restrictions_edit	streng	(forældet) Brug page_restrictions_edit i stedet.
Beskyttelsesniveau for redigering af siden	page_restrictions_edit	array of strings
Beskyttelsesniveau for flytning af siden	article_restrictions_move	streng	(forældet) Brug page_restrictions_move i stedet.
Beskyttelsesniveau for flytning af siden	page_restrictions_move	array of strings
Upload beskyttelse af filen	article_restrictions_upload	streng	(forældet) Brug page_restrictions_upload i stedet.
Upload beskyttelse af filen	page_restrictions_upload	array of strings
Beskyt siden mod oprettelse	article_restrictions_create	streng	(forældet) Brug page_restrictions_create i stedet.
Beskyt siden mod oprettelse	page_restrictions_create	array of strings
Seneste ti brugere som har bidraget til siden	article_recent_contributors	array of strings	(forældet) Brug page_recent_contributors i stedet.
Seneste ti brugere som har bidraget til siden	page_recent_contributors	array of strings	This tends to be slow (see #Performance). Try to put conditions more likely evaluate to false before this one, to avoid unnecessarily running the query. This value is empty if the user is the only contributor to the page(?), and only scans the last 100 revisions
Første bruger til at bidrage til siden	article_first_contributor	streng	(forældet) Brug page_first_contributor i stedet.
Første bruger til at bidrage til siden	page_first_contributor	streng	This tends to be slow (see #Performance). Try to put conditions more likely evaluate to false before this one, to avoid unnecessarily running the query.

Variabler tilgængelige for nogle handlinger

Forsigtig:

Always check that the variables you want to use are available for the current action being filtered, e.g. by using the action variable. Failing to do so (for instance using accountname for an edit, or edit_delta for a deletion) will make any code using the variable in question return false.

Edit variables are not available when examining past uploads. (T345896)

Beskrivelse	Navn	Datatype	Bemærkninger
Redigeringssammenfatning	summary	streng	Summaries automatically created by MediaWiki ("New section", "Blanked the page", etc.) are created after the filter checks the edit, so they will never actually catch, even if the debugger shows that they should. The variable contains whatever the user sees in the edit summary window, which may include MediaWiki preloaded section titles.
Om redigeringen er markeret som mindre ændring (bruges ikke længere)	minor_edit	streng	Disabled, and set to false for all entries between 2016 and 2018.
Den gamle sides wikitekst, før redigeringen	old_wikitext	streng	Denne variabel kan være meget stor. Consider using removed_lines if possible to improve performance.
Den nye sides wikitekst, efter redigeringen	new_wikitext	streng	Denne variabel kan være meget stor. Consider using added_lines if possible to improve performance.
Samlet diff af ændringer foretaget i redigering	edit_diff	streng
Unified diff of changes made by edit, pre-save transformed ($1)	edit_diff_pst	streng	This tends to be slow (see #Performance). Checking both added_lines and removed_lines is probably more efficient.
Ny sidestørrelse	new_size	integer
Gammel sidestørrelse	old_size	integer
Størrelse ændret i redigering	edit_delta	integer
Lines added in edit, pre-save transformed ($1)	added_lines_pst	array of strings	Use added_lines if possible, which is more efficient.
Linjer tilføjet i redigering	added_lines	array of strings	includes all lines in the final diff that begin with +
Linjer fjernet i redigering	removed_lines	array of strings
Alle eksterne henvisninger i den nye tekst	all_links	array of strings	This tends to be slow (see #Performance).
Henvisninger på siden, før redigeringen	old_links	array of strings	This tends to be slow (see #Performance).
Alle eksterne henvisninger tilføjet i redigeringen	added_links	array of strings	This tends to be slow (see #Performance). Consider checking against added_lines first, then check added_links so that fewer edits are slowed down. This follows MediaWiki's rules for external links . Only unique links are added to the array. Changing a link will count as 1 added and 1 removed link.
Alle eksterne henvisninger fjernet i redigeringen	removed_links	array of strings	This tends to be slow (see #Performance). Consider checking against removed_lines first, then check removed_links so that fewer edits are slowed down. This follows MediaWiki's rules for external links . Only unique links are added to the array. Changing a link will count as 1 added and 1 removed link.
Ny side wikitekst, transformeret før den er gemt	new_pst	streng	This variable can be very large.
Tolket HTML-kildekode for den nye revision	new_html	streng	Denne variabel kan være meget stor. Consider using added_lines if possible to improve performance.
Ny sidetekst, uden opmarkering	new_text	streng	Denne variabel kan være meget stor. Consider using added_lines if possible to improve performance.
Den gamle sides wikitekst, tolket til HTML (ikke længere i brug)	old_html	streng	Disabled for performance reasons.
Gammel sidetekst, uden opmarkering	old_text	streng	Disabled for performance reasons.
Time since last page edit in seconds ($1)	page_last_edit_age	integer or null	null when the page does not exist
SHA1-hash af filindhold	file_sha1	streng
Filstørrelsen i bytes	file_size	integer	Filstørrelsen i bytes
Filens bredde i pixels	file_width	integer	Bredden i pixels
Filens højde i pixels	file_height	integer	Højden i pixels
Bits per color channel of the file ($1)	file_bits_per_channel	integer	The amount of bits per color channel
Filens MIME-type	file_mime	streng	The file MIME type.
Filens medietype	file_mediatype	streng	Filmedietypen.
Side-ID på destinationsside ved flytning	moved_to_articleid	integer	(forældet) Brug moved_to_id i stedet.
Side-ID på destinationsside ved flytning	moved_to_id	integer
Titel på destinationsside ved flytning	moved_to_text	streng	(forældet) Brug moved_to_title i stedet.
Titel på destinationsside ved flytning	moved_to_title	streng
Fuld titel på destinationsside ved flytning	moved_to_prefixedtext	streng	(forældet) Brug moved_to_prefixedtitle i stedet.
Fuld titel på destinationsside ved flytning	moved_to_prefixedtitle	streng
Navnerum på destinationsside ved flytning	moved_to_namespace	integer
Move destination page age in seconds ($1)	moved_to_age	integer
Time since last move destination page edit in seconds ($1)	moved_to_last_edit_age	integer or null	null when the target page does not exist
Edit protection level of move destination page ($1)	moved_to_restrictions_edit	array of string	Same as page_restrictions_edit, but for the target of the move.
Move protection level of move destination page ($1)	moved_to_restrictions_move	array of string	Same as page_restrictions_move, but for the target of the move.
Upload protection of move destination file ($1)	moved_to_restrictions_upload	array of string	Same as page_restrictions_upload, but for the target of the move.
Create protection of move destination page ($1)	moved_to_restrictions_create	array of string	Same as page_restrictions_create, but for the target of the move.
Last ten users to contribute to move destination page ($1)	moved_to_recent_contributors	array of strings	Same as page_recent_contributors, but for the target of the move.
First user to contribute to move destination page ($1)	moved_to_first_contributor	streng	Same as page_first_contributor, but for the target of the move.
Navnerum på kildeside ved flytning	moved_from_namespace	integer
Titel på kildeside ved flytning	moved_from_text	streng	(forældet) Brug moved_from_title i stedet.
Titel på kildeside ved flytning	moved_from_title	streng
Fuld titel på kildeside ved flytning	moved_from_prefixedtext	streng	(forældet) Brug moved_from_prefixedtitle i stedet.
Fuld titel på kildeside ved flytning	moved_from_prefixedtitle	streng
Side-ID på kildeside ved flytning	moved_from_articleid	integer	(forældet) Brug moved_from_id i stedet.
Side-ID på kildeside ved flytning	moved_from_id	integer
Move source page age in seconds ($1)	moved_from_age	integer
Time since last move source page edit in seconds ($1)	moved_from_last_edit_age	integer
Edit protection level of move source page ($1)	moved_from_restrictions_edit	array of string	Same as page_restrictions_edit, but for the page being moved.
Move protection level of move source page ($1)	moved_from_restrictions_move	array of string	Same as page_restrictions_move, but for the page being moved.
Upload protection of move source file ($1)	moved_from_restrictions_upload	array of string	Same as page_restrictions_upload, but for the page being moved.
Create protection of move source page ($1)	moved_from_restrictions_create	array of string	Same as page_restrictions_create, but for the page being moved.
Last ten users to contribute to move source page ($1)	moved_from_recent_contributors	array of strings	Same as page_recent_contributors, but for the page being moved.
First user to contribute to move source page ($1)	moved_from_first_contributor	streng	Same as page_first_contributor, but for the page being moved.
Kontonavn (on account creation)	accountname	streng
Content model of the old revision	old_content_model	streng	See Help:ChangeContentModel for information about content model changes
Content model of the new revision	new_content_model	streng	See Help:ChangeContentModel for information about content model changes

Protected variables

A variable can be considered protected. For instance, on wikis with temporary accounts enabled, IPs are considered PII and access to them must be restricted. Protected variables and filters that use them are only accessible to maintainers with the abusefilter-access-protected-vars right. Using a protected variable flags the filter as protected as well. The filter subsequently cannot be unprotected, even if it no longer actively uses a protected variable, as its historical logs will remain available.

Logs generated by protected filters can only be viewed by users with the abusefilter-protected-vars-log right.

The default protected variables are defined in AbuseFilterProtectedVariables in extension.json.

user_unnamed_ip is null when examining past edits.

Description	Name	Data type	Notes
IP of the user account (for logged-out users and temporary accounts only) ($1)	user_unnamed_ip	string	User IP for anonymous users/temporary accounts This returns null for registered users.

Variables from other extensions

Most of these variables are always set to false when examinating past edits, and may not reflect their actual value at the time the edit was made. Se T102944.

Beskrivelse	Navn	Datatype	Værdier	Tilføjet af
Globale grupper, som brugeren er i ($1)	global_user_groups	array		CentralAuth
Global edit count of the user ($1)	global_user_editcount	integer		CentralAuth
Global groups that the user is in on account creation ($1)	global_account_groups	array	Available only when action is createaccount (then it is always empty) or autocreateaccount.	CentralAuth
Global edit count of the user on account creation ($1)	global_account_editcount	integer	Available only when action is createaccount (then it is always zero) or autocreateaccount.	CentralAuth
OAuth consumer used to perform this change ($1)	oauth_consumer	integer		OAuth
Page ID of Structured Discussions board ($1)	board_articleid	integer	(forældet) Brug board_id i stedet.	StructuredDiscussions
Page ID of Structured Discussions board ($1)	board_id	integer		StructuredDiscussions
Namespace of Structured Discussions board ($1)	board_namespace	integer	refers to namespace index	StructuredDiscussions
Title (without namespace) of Structured Discussions board ($1)	board_text	streng	(forældet) Brug board_title i stedet.	StructuredDiscussions
Title (without namespace) of Structured Discussions board ($1)	board_title	streng		StructuredDiscussions
Full title of Structured Discussions board ($1)	board_prefixedtext	streng	(forældet) Brug board_prefixedtitle i stedet.	StructuredDiscussions
Full title of Structured Discussions board ($1)	board_prefixedtitle	streng		StructuredDiscussions
Source text of translation unit	translate_source_text	streng		Oversæt
Target language for translation	translate_target_language	streng	This is the language code, like en for English.	Oversæt
Hvorvidt ændringen blev foretaget gennem en Tor udgangsknude	tor_exit_node	boolean	true if the action comes from a tor exit node.	TorBlock
Hvorvidt en bruger redigerer via mobilgrænsefladen ($1)	user_mobile	boolean	true for mobile users, false otherwise.	MobileFrontend
Whether the user is editing from mobile app ($1)	user_app	boolean	true if the user is editing from the mobile app, false otherwise.	MobileApp
Sidevisninger[1]	article_views	heltal	(forældet) Brug page_views i stedet.	HitCounters
Sidevisninger[2]	page_views	heltal	antallet af sidevisninger	HitCounters
Source page views[3]	moved_from_views	heltal	the amount of page views of the source page	HitCounters
Target page views[4]	moved_to_views	heltal	the amount of page views of the target page	HitCounters
Whether the IP address is blocked using the stopforumspam.com list[5]	sfs_blocked	boolean	Whether the IP address is blocked using the stopforumspam.com list	StopForumSpam

Notes

When action='move', only the summary, action, timestamp and user_* variables are available. The page_* variables are also available, but the prefix is replaced by moved_from_ and moved_to_, that represent the values of the original article name and the destination one, respectively. For example, moved_from_title and moved_to_title instead of page_title.

Since MediaWiki 1.28 (gerrit:295254), action='upload' is only used when publishing an upload, and not for uploads to stash. A new action='stashupload' is introduced, which is used for all uploads, including uploads to stash. This behaves like action='upload' used to, and only provides file metadata variables (file_*). Variables related to the page edit, including summary, new_wikitext and several others, are now available for action='upload'. For every file upload, filters may be called with action='stashupload' (for uploads to stash), and are always called with action='upload'; they are not called with action='edit'.

Filter authors should use action='stashupload' | action='upload' in filter code when a file can be checked based only on the file contents – for example, to reject low-resolution files – and action='upload' only when the wikitext parts of the edit need to be examined too – for example, to reject files with no description. This allows tools that separate uploading the file and publishing the file (e.g. UploadWizard or upload dialog ) to inform the user of the failure before they spend the time filling in the upload details.

Performance

As noted in the table above, some of these variables can be very slow. While writing filters, remember that the condition limit is not a good metric of how heavy filters are. For instance, variables like *_recent_contributors or *_links always need a DB query to be computed, while *_pst variables will have to perform parsing of the text, which again is a heavy operation; all these variables should be used very, very carefully. For instance, on Italian Wikipedia it's been observed that, with 135 active filters and an average of 450 used conditions, filters execution time was around 500ms, with peaks reaching 15 seconds. Removing the added_links variable from a single filter, and halving the cases when another filter would use added_lines_pst brought the average execution time to 50ms. More specifically:

• Use _links variables when you need high accuracy and checking for "http://..." in other variables (for instance, added_lines) could lead to heavy malfunctioning;

• Use _pst variables when you're really sure that non-PST variables aren't enough.

You may also conditionally decide which one to check: if, for instance, you want to examine a signature, check first if added_lines contains ~~~;

• In general, when dealing with these variables, it's always much better to consume further conditions but avoid computing heavy stuff.

In order to achieve this, always put heavy variables as last conditions.

Last but not least, note that whenever a variable is computed for a given filter, it'll be saved and any other filter will immediately retrieve it. This means that one single filter computing this variable counts more or less as dozens of filters using it.

Keywords

Where not specifically stated, keywords cast their operands to strings

The following special keywords are included for often-used functionality:

• like (or matches) returns true if the left-hand operand matches the glob pattern in the right-hand operand.
• in returns true if the right-hand operand (a string) contains the left-hand operand. Note: empty strings are not contained in, nor contain, any other string (not even the empty string itself).
• contains works like in, but with the left and right-hand operands switched. Note: empty strings are not contained in, nor contain, any other string (not even the empty string itself).
• rlike (or regex) and irlike return true if the left-hand operand matches (contains) the regex pattern in the right-hand operand (irlike is case insensitive).
  • The system uses PCRE.
  • The only PCRE option enabled is PCRE_UTF8 (modifier u in PHP); for irlike both PCRE_CASELESS and PCRE_UTF8 are enabled (modifier iu).
• if ... then ... end
• if ... then ... else ... end
• ... ? ... : ...
• true, false, null

Eksempler

Kode	Resultat	Kommentar
"1234" like "12?4"	True
"1234" like "12*"	True
"foo" in "foobar"	True
"foobar" contains "foo"	True
"o" in ["foo", "bar"]	True	Due to the string cast
"foo" regex "\w+"	True
"a\b" regex "a\\\\b"	True	To look for the escape character backslash using regex you need to use either four backslashes or two \x5C. (Either works fine.)
"a\b" regex "a\x5C\x5Cb"	True

Funktioner

A number of built-in functions are included to ease some common issues. They are executed in the general format functionName( arg1, arg2, arg3 ), and can be used in place of any literal or variable. Its arguments can be given as literals, variables, or even other functions.

navn	beskrivelse
lcase	Returns the argument converted to lower case.
ucase	Returns the argument converted to upper case.
length	Returns the length of the string given as the argument. If the argument is an array, returns its number of elements.
string	Casts to string data type. If the argument is an array, implodes it with linebreaks.
int	Casts to integer data type.
float	Casts to floating-point data type.
bool	Casts to boolean data type.
norm	Equivalent to rmwhitespace(rmspecials(rmdoubles(ccnorm(arg1)))).
ccnorm	Normalises confusable/similar characters in the argument, and returns a canonical form. A list of characters and their replacements can be found on git, e.g. ccnorm( "Eeèéëēĕėęě3ƐƷ" ) === "EEEEEEEEEEEEE". The output of this function is always uppercase. While not expensive, this function isn't cheap either, and could slow a filter down if called many times.
ccnorm_contains_any	Normalises confusable/similar characters in all its arguments, and returns true if the first string contains any string from the following arguments (unlimited number of arguments, logic OR mode). A list of characters and their replacements can be found on git. Due to the usage of ccnorm, this function can be slow if passed too many arguments.
ccnorm_contains_all	Normalises confusable/similar characters in all its arguments, and returns true if the first string contains every string from the following arguments (unlimited number of arguments, logic AND mode). A list of characters and their replacements can be found on git. Due to the usage of ccnorm, this function can be slow if passed too many arguments.
specialratio	Returns the number of non-alphanumeric characters divided by the total number of characters in the argument.
rmspecials	Removes any special characters in the argument, and returns the result. Does not remove whitespace. (Equivalent to s/[^\p{L}\p{N}\s]//g.)
rmdoubles	Removes repeated characters in the argument, and returns the result.
rmwhitespace	Removes whitespace (spaces, tabs, newlines).
count	Returns the number of times the needle (first string) appears in the haystack (second string). If only one argument is given, splits it by commas and returns the number of segments.
rcount	Similar to count but the needle uses a regular expression instead. Can be made case-insensitive by letting the regular expression start with "(?i)". Please note that, for plain strings, this function can be up to 50 times slower than count, so use that one when possible.
get_matches	MW 1.31+ Looks for matches of the regex needle (first string) in the haystack (second string). Returns an array where the 0 element is the whole match and every [n] element is the match of the n'th capturing group of the needle. Can be made case-insensitive by letting the regular expression start with "(?i)". If a capturing group didn't match, that array position will take value of false.
ip_in_range	Returns true if user's IP (first string) matches the specified IP range (second string, can be in CIDR notation, explicit notation like "1.1.1.1-2.2.2.2", or a single IP). Only works for anonymous users. Supports both IPv4 and IPv6 addresses.
ip_in_ranges	Returns true if user's IP (first string) matches any of the specified IP ranges (following strings in logic OR mode, can be in CIDR notation, explicit notation like "1.1.1.1-2.2.2.2", or a single IP). Only works for anonymous users. Supports both IPv4 and IPv6 addresses.
contains_any	Returns true if the first string contains any string from the following arguments (unlimited number of arguments in logic OR mode). If the first argument is an array, it gets casted to string.
contains_all	Returns true if the first string contains every string from the following arguments (unlimited number of arguments in logic AND mode). If the first argument is an array, it gets casted to string.
equals_to_any	Returns true if the first argument is identical (===) to any of the following ones (unlimited number of arguments). Basically, equals_to_any(a, b, c) is the same as a===b | a===c, but more compact and saves conditions.
substr	Returns the portion of the first string, by offset from the second argument (starts at 0) and maximum length from the third argument (optional).
strlen	Same as length.
strpos	Returns the numeric position of the first occurrence of needle (second string) in the haystack (first string), starting from offset from the third argument (optional, default is 0). This function may return 0 when the needle is found at the beginning of the haystack, so it might be misinterpreted as false value by another comparative operator. The better way is to use === or !== for testing whether it is found. Differently from PHP's strpos(), which returns false when the needle is not found, this function returns -1 when the needle is not found.
str_replace	Replaces all occurrences of the search string with the replacement string. The function takes 3 arguments in the following order: text to perform the search on, text to find, replacement text.
str_replace_regexp	Replaces all occurrences of the search string with the replacement string using regular expressions. The function takes 3 arguments in the following order: text to perform the search on, regular expression to match, replacement expression.
rescape	Returns the argument with some characters preceded with the escape character "\", so that the string can be used in a regular expression without those characters having a special meaning.
set	Sets a variable (first string) with a given value (second argument) for further use in the filter. Another syntax: name := value.
set_var	Samme som set.

Eksempler

Kode	Resultat	Kommentar
length( "Wikipedia" )	9
lcase( "WikiPedia" )	wikipedia
ccnorm( "w1k1p3d14" )	WIKIPEDIA	ccnorm output is always uppercase
ccnorm( "ωɨƙɩᑭƐƉ1α" )	WIKIPEDIA
ccnorm_contains_any( "w1k1p3d14", "wiKiP3D1A", "foo", "bar" )	true
ccnorm_contains_any( "w1k1p3d14", "foo", "bar", "baz" )	false
ccnorm_contains_any( "w1k1p3d14 is 4w3s0me", "bar", "baz", "some" )	true
ccnorm( "ìíîïĩїį!ľ₤ĺľḷĿ" )	IIIIIII!LLLLLL
norm( "!!ω..ɨ..ƙ..ɩ..ᑭᑭ..Ɛ.Ɖ@@1%%α!!" )	WIKIPEDAIA
norm( "F00 B@rr" )	FOBAR	norm removes whitespace, special characters and duplicates, then uses ccnorm
rmdoubles( "foobybboo" )	fobybo
specialratio( "Wikipedia!" )	0.1
count( "foo", "foofooboofoo" )	3
count( "foo,bar,baz" )	3
rmspecials( "FOOBAR!!1" )	FOOBAR1
rescape( "abc* (def)" )	abc\* \(def\)
str_replace( "foobarbaz", "bar", "-" )	foo-baz
str_replace_regexp( "foobarbaz", "(.)a(.)", "$2a$1" )	foorabzab
ip_in_range( "127.0.10.0", "127.0.0.0/12" )	true
ip_in_ranges( "127.0.10.0", "10.0.0.0/8", "127.0.0.0/12" )	true
contains_any( "foobar", "x", "y", "f" )	true
get_matches( "(foo?ba+r) is (so+ good)", "fobaaar is soooo good to eat" )	['fobaaar is soooo good', 'fobaaar', 'soooo good']

Order of operations

Operations are generally done left-to-right, but there is an order to which they are resolved. As soon as the filter fails one of the conditions, it will stop checking the rest of them (due to short-circuit evaluation) and move on to the next filter. The evaluation order is:

1. Anything surrounded by parentheses (( and )) is evaluated as a single unit.
2. Turning variables/literals into their respective data. (e.g., page_namespace to 0)
3. Function calls (norm, lcase, etc.)
4. Unary + and - (defining positive or negative value, e.g. -1234, +1234)
5. Nøgleord (in, rlike, osv.)
6. Boolean inversion (!x)
7. Exponentiation (2**3 → 8)
8. Multiplication-related (multiplication, division, modulo)
9. Addition and subtraction (3-2 → 1)
10. Comparisons (<, >, ==)
11. Boolean operations (&, |, ^)
12. Ternary operator (... ? ... : ...)
13. Assignments (:=)

Eksempler

• A & B | C is equivalent to (A & B) | C, not to A & (B | C). In particular, both false & true | true and false & false | true evaluates to true.
• A | B & C is equivalent to (A | B) & C, not to A | (B & C). In particular, both true | true & false and true | false & false evaluates to false.
• added_lines rlike "foo" + "|bar" is wrong, use added_lines rlike ("foo" + "|bar") instead.

Condition counting

The condition limit is (more or less) tracking the number of comparison operators + number of function calls entered.

Further explanation on how to reduce conditions used can be found at Extension:AbuseFilter/Conditions .

Exclusions

Although the AbuseFilter examine function will identify "rollback" actions as edits, the AbuseFilter will not evaluate rollback actions for matching.

Nyttige links

• PCRE pattern syntax
• Edit filters of cross-wiki interest
• Extension:AbuseFilter/Conditions