Regular Expression

<?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)", $_SERVER["HTTP_USER_AGENT"]);

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

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

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

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