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PHP Manual


Introduction

Tip

PHP also supports regular expressions using a Perl-compatible syntax using the PCRE functions. Those functions support non-greedy matching, assertions, conditional subpatterns, and a number of other features not supported by the POSIX-extended regular expression syntax.

Warning

These regular expression functions are not binary-safe. The PCRE functions are.

Note:

As of PHP 5.3.0 this extension is deprecated, calling any function provided by this extension will issue an E_DEPRECATED notice.

Regular expressions are used for complex string manipulation. PHP uses the POSIX extended regular expressions as defined by POSIX 1003.2. For a full description of POSIX regular expressions see the » regex man pages included in the regex directory in the PHP distribution. It's in manpage format, so you'll want to do something along the lines of man /usr/local/src/regex/regex.7 in order to read it.




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