Perl-Compatible Regular Expressions
Andrei Zmievski added support to PHP for Perl-compatible regular expressions. Expressions are surrounded by delimiters, which are usually / or | characters, but can be any printable character other than a number, letter, or backslash. After the second delimiter, you may place one or more modifiers. These are letters that change the way the regular expression is interpreted.
For the most part, the functions in this section comply with the way regular expressions work in Perl 5. There are a few very specific differences. They are narrow enough that you probably won't run into them, and they may not make much sense without explaining regular expressions in detail. If you're curious, read the excellent notes in ...
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