07. URL Replacer

<?php

$input = trim(fgets(STDIN));

$replace = preg_replace('/\<a [^>]*?href\s*=\s*\'([^<>\s]*)\'[^\<]*>((\s|.)+?)\<\/a\>/i', "[URL=$1]$2[/URL]", $input);

$replace = preg_replace('/\<a [^>]*?href\s*=\s*"([^<>\s]*)"[^\<]*>((\s|.)+?)\<\/a\>/i', "[URL=$1]$2[/URL]", $replace);

echo $replace;