Finetune Regex to skip tags

问题

Code must skip existing links, <img>'s src values (or something like that)

public function convertUrlsToLinks($text){
    return preg_replace('@(https?://([-\w\.]+)+(:\d+)?(/([\w/_\.-]*(\?\S+)?)?)?)@', '<a href="$1" target="_blank">$1</a>', $text);
}

Can't figure out, what I need to modify in this function?

回答1:

Add a small part to your regex that checks if your regex isn't 'inside' a tag. So it should be

     <tag>HERE</tag> 

and not

     <tag src="HERE"></tag>.

Since a url will always be INSIDE the html tag it should work if you finetune your regex to this use. I'm not a pro with regex' so can't help you more than this, but I think this should get you in the right direction.

来源：https://stackoverflow.com/questions/11958903/finetune-regex-to-skip-tags