I have a problem with a difficult regex. I have this expression to detect absolute urls (http and https
/(url {0,}\(( {0,}'| {0,}"|))(?!http|data\:).*?\)/im
What I want to do basically is with preg_replace to prepend the url with a path $path defined in my script. Basically this regex results in two capture groups:
group 1: (url {0,}\(( {0,}'| {0,}"|))(?!http).*?\)
group 2: ( {0,}'| {0,}"|)
How can I match all the way until the uri starts and then prepend it with $path? I can't seem to get the capturing groups right.
You can use something like this:
$re = '/\b url \s*+ \( \s*+ (?| " ([^"]*+) " | \' ([^\']*+) \' | (\S*+) ) \s*+ \) /ix';
$str = preg_replace_callback($re, function ($match) {
$url = $match[1];
// do some check on the url
if(whatever)
return $match[0]; // return without change
// do whatever you want with the URL
// return new url
return "url(\"$url\")";
}, $str);