简介

Note:

从PHP5.3.0开始本扩展不再建议使用，所有调用本扩展中函数都将提示E_DEPRECATED 错误。

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.