Organizacja Imprez Meta-characters

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Meta-characters

The power of regular expressions comes from the ability to include alternatives and repetitions in the pattern. These are encoded in the pattern by the use of meta-characters, which do not stand for themselves but instead are interpreted in some special way.

There are two different sets of meta-characters: those that are recognized anywhere in the pattern except within square brackets, and those that are recognized in square brackets. Outside square brackets, the meta-characters are as follows:

\: general escape character with several uses
^: assert start of subject (or line, in multiline mode)
$: assert end of subject (or line, in multiline mode)
.: match any character except newline (by default)
[: start character class definition
]: end character class definition
|: start of alternative branch
(: start subpattern
): end subpattern
?: extends the meaning of (, also 0 or 1 quantifier, also makes greedy quantifiers lazy (see repetition)
*: 0 or more quantifier
+: 1 or more quantifier
{: start min/max quantifier
}: end min/max quantifier

Part of a pattern that is in square brackets is called a "character class". In a character class the only meta-characters are:

\: general escape character
^: negate the class, but only if the first character
-: indicates character range
]: terminates the character class

The following sections describe the use of each of the meta-characters.

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Meta-characters