Email URL的判断和自动转换函数

<?php
function validateEmail($email)
{ return eregi("^[_a-z0-9-] (.[_a-z0-9-] )*@[a-z0-9-] (.[a-z0-9-] )*(.[a-z]{2,3})$", $email);
}

function validateURL($url)
{ return eregi("^((ht|f)tp://)((([a-z0-9-] (.[a-z0-9-] )*(.[a-z]{2,3}))|(([0-9]{1,3}.){3}([0-9]{1,3})))((/|?)[a-z0-9~#%&'_ =:?.-]*)*)$", $url);
}

function convertURLS($text)
{ $text = eregi_replace("((ht|f)tp://www.|www.)([a-z0-9-] (.[a-z0-9-] )*(.[a-z]{2,3})((/|?)[a-z0-9~#%&/'_ =:?.-]*)*)", "http://*ww*w*.3", $text);
$text = eregi_replace("((ht|f)tp://)((([a-z0-9-] (.[a-z0-9-] )*(.[a-z]{2,3}))|(([0-9]{1,3}.){3}([0-9]{1,3})))((/|?)[a-z0-9~#%&'_ =:?.-]*)*)", "