preg_replace_callback 正则表达式匹配所有 url 并避免图像

Question

I have this regex to match all urls and works great:

$regex ='@((https?://)([-\w]+\.[-\w\.]+)+\w(:\d+)?(/([-\w/_\.\,]*(\?\S+)?)?)*)@';                           
return preg_replace_callback( $regex, 'replacing' , $content );

I need to avoid match urls inside: src="***" and <a href="">***</> want to keep the text but replace url.

I've tried: adding negation to my regex:

$regex ='@((?!src="|?!>)(https?://)([-\w]+\.[-\w\.]+)+\w(:\d+)?(/([-\w/_\.\,]*(\?\S+)?)?)*)@';

first negation when url is startin with src=" second negation is when is between a href a href >

Any ideas to make it work?

Answer 1

A good starting place is lib_autolink which handles the <a> case and could be easily adapted for the <img> case. It is non-trivial and perhaps impossible to do this in a single regexp unless you can guarantee that the HTML is perfectly valid (no stray quotation marks in text, etc).