Regular Expressions for Perl, C, PHP, Python, Java, and .NET
Regular Expression
Pocket Reference
Tony Stubblebine
Regular Expression
Pocket Reference
Regular Expression
Pocket Reference
Tony Stubblebine
Beijing Cambridge Farnham Kln Paris Sebastopol Taipei Tokyo
PHP
This reference covers PHP 4.3's Perl-style regular expression support contained within the preg routines. PHP also provides POSIX-style regular expressions, but these do not offer additional benefit in power or speed. The preg routines use a Traditional NFA match engine. For an explanation of the rules behind an NFA engine, see "Introduction to Regexes and Pattern Matching."
Supported Metacharacters
PHP supports the metacharacters and metasequences listed in Tables 31 through 35. For expanded definitions of each metacharacter, see "Regex Metacharacters, Modes, and Constructs."
Table 31. Character representations Sequence
\a \b \e \n \r \f \t \octal \xhex \x{hex} \cchar
Meaning Alert (bell), x07. Backspace, x08, supported only in character class. ESC character, x1B. Newline, x0A. Carriage return, x0D. Form feed, x0C. Horizontal tab, x09 Character specified by a three-digit octal code. Character specified by a one- or two-digit hexadecimal code. Character specified by any hexadecimal code. Named control character.
Table 32. Character classes and class-like constructs Class
[...]
Meaning A single character listed or contained within a listed range.
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Table 32. Character classes and class-like constructs Class
[^...] [:class:] . \C \w \W \d \D \s \S
Meaning A single character not listed and not contained within a listed range. POSIX-style character class valid only within a regex character class. Any character except newline (unless single-line mode,/s). One byte; however, this may corrupt a Unicode character stream. Word character, [a-zA-z0-9_]. Non-word character, [^a-zA-z0-9_]. Digit character, [0-9]. Non-digit character, [^0-9]. Whitespace character, [\n\r\f\t ]. Non-whitespace character, [^\n\r\f\t ].

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