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You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.
A metacharacter is a character that has a special meaning to a computer program, such as a shell interpreter or a regular expression (regex) engine.. In POSIX extended regular expressions, there are 14 metacharacters that must be escaped — preceded by a backslash (\) — in order to drop their special meaning and be treated literally inside an expression: opening and closing square brackets ...
The second is a link to the article that details that symbol, using its Unicode standard name or common alias. (Holding the mouse pointer on the hyperlink will pop up a summary of the symbol's function.); The third gives symbols listed elsewhere in the table that are similar to it in meaning or appearance, or that may be confused with it;
Greed, in regular expression context, describes the number of characters which will be matched (often also stated as "consumed") by a variable length portion of a regular expression – a token or group followed by a quantifier, which specifies a number (or range of numbers) of tokens. If the portion of the regular expression is "greedy", it ...
(literal character) a in Σ denoting the set containing only the character a. Given regular expressions R and S, the following operations over them are defined to produce regular expressions: (concatenation) (RS) denotes the set of strings that can be obtained by concatenating a string accepted by R and a string accepted by S (in that order ...
A Unicode character is assigned a unique Name (na). [1] The name is composed of uppercase letters A–Z, digits 0–9, hyphen-minus and space.Some sequences are excluded: names beginning with a space or hyphen, names ending with a space or hyphen, repeated spaces or hyphens, and space after hyphen are not allowed.
SMALL HYPHEN-MINUS U+FE63: Pd, dash Common － FULLWIDTH HYPHEN-MINUS U+FF0D: Pd, dash Common ֊ ARMENIAN HYPHEN U+058A: Pd, dash Armenian ᐀ CANADIAN SYLLABICS HYPHEN U+1400: Pd, dash Canadian Aboriginal ־ HEBREW PUNCTUATION MAQAF U+05BE: Pd, dash Hebrew ᠆ MONGOLIAN TODO SOFT HYPHEN U+1806: Pd, dash Mongolian ອ YEZIDI HYPHENATION MARK U+ ...
It is easier, that is, if you already understand how templates "escape" the pipe character and the equals sign. See Help:Template#Parameters for other important details. The procedure here is an iterative, read-evaluate-modify cycle. Regex development requires that you study the target data while writing and rewriting its pattern.