regex to handle different parts of a URL (host, path, query, anchor...)

regex-url-parts.php

<?php

    $re = "/^(([^:\\/?#]+):)?(\\/\\/([^\\/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?/"; 
    $str = "http://www.ics.uci.edu/pub/ietf/uri/?page=3&color=red#Related\n"; 
     
    preg_match($re, $str, $matches);
    
    /* matches will be
    1.	[0-5]	`http:`
    2.	[0-4]	`http`
    3.	[5-22]	`//www.ics.uci.edu`
    4.	[7-22]	`www.ics.uci.edu`
    5.	[22-36]	`/pub/ietf/uri/`
    6.	[36-53]	`?page=3&color=red`
    7.	[37-53]	`page=3&color=red`
    8.	[53-61]	`#Related`
    9.	[54-61]	`Related`
    */