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://www.\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~#%&'_+=:?.-]*)*)", "<a href="\0">\0</a>", $text);  
    return $text;  
}  

function convertmail($text)  
{     $text = eregi_replace("([_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3}))", "<a href='mailto:\0'>\0</a>", $text);  
    return $text;  
}  

function convertalllinks($text)  
{     $text = converturls($text);  
    $text = convertmail($text);  
    return $text;  
}
?>  

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