I saw the other posts but none of them help me ...
So, i tried to match url in a string in javascript with regex it works perfectly on regex101 but fails in javascript.
var matches = feed.content.match(
'/((http|https|ftp):\/\/([a-zA-Z0-9\.\-\_\%]+\/?){1}([a-zA-Z0-9\.\-\_]+\/?)*(\?[a-zA-Z0-9\.\-\_\%\+\=\&\:]*)*)/ig'
);
And firebug returns me
SyntaxError: invalid quantifier
Please can you help me ?
As pointed out in the comments, you should remove the single quotes enclosing the regex. As well as that, I would propose making a few changes to the expression itself:
((https?|ftp):\/\/([\w.%-]+\/?)([\w.-]+\/?)*(\?[\w.%+=&:-]*)*)
The ? after the smeans that it is optional, so http and https will both match. \w is the word character class, so that covers A-Za-z0-9_ much more concisely. There's no need to escape all the symbols but a useful trick is to put the - at the end of the character class, so that it isn't interpreted as a range between two characters. The {1} isn't necessary as that's the default behaviour.
You're passing the regex as a string - just get rid of the outer quotes.
var matches = feed.content.match(
/((http|https|ftp):\/\/([a-zA-Z0-9\.\-\_\%]+\/?){1}([a-zA-Z0-9\.\-\_]+\/?)*(\?[a-zA-Z0-9\.\-\_\%\+\=\&\:]*)*)/ig
);
var re = new RegExp('((https?|ftp)://([\\w%.-]+/?)([\\w.-]+/?)*(\\?[\\w%.+=&:-]*)*)', 'gi')