RegExp - см любой ресурс PHP/PERL - примеров море.

Иван FXS ShuhardPHP/PERL - примеров море.
- ага ... только я использую RegExp из Microsoft VBScript Regular Expresions 5.5, а не из PHP/PERL :-(
Гм - а это меняет синтаксис ?
PHP
<?php
// Returns true if "abc" is found anywhere in $string.
ereg ("abc", $string);

// Returns true if "abc" is found at the beginning of $string.
ereg ("^abc", $string);

// Returns true if "abc" is found at the end of $string.
ereg ("abc$", $string);

// Returns true if client browser is Netscape 2, 3 or MSIE 3.
eregi ("(ozilla.[23]|MSIE.3)", $HTTP_USER_AGENT);

// Places three space separated words into $regs[1], $regs[2] and $regs[3].
ereg ("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+)", $string,$regs);

// Put a <br /> tag at the beginning of $string.
$string = ereg_replace ("^", "<br />", $string);

// Put a <br /> tag at the end of $string.
$string = ereg_replace ("$", "<br />", $string);

// Get rid of any newline characters in $string.
$string = ereg_replace ("\n", "", $string);
?>