JavaScript RegEx end of string not working

Question

I want to redirect certain facebook urls. So far I have a working chrome plugin, but some urls are not matched the right way.

var patternURL = new RegExp("http(s)?://www\.facebook\.com(/|/@?ref=(tn_tnmn|logo)+)?$", "m");

Should match:

https://www.facebook.com/?ref=tn_tnmn
https://www.facebook.com/?ref=logo
https://www.facebook.com/
https://www.facebook.com

But not:

https://www.facebook.com/messages/

It seams in JavaScript the end of string ($) is not recognized correctly. Thats what my jsfiddle demo shows so far. It should be True but is always false even with "m".

What do I do wrong?

Like this "http(s)?://www\.facebook\.com(/|/@?ref=*)$"? Yes. — lony
– lony, Commented Jun 14, 2014 at 11:43

Mosho · Accepted Answer · 2014-06-14 13:24:48Z

2

The ? is not escaped. You need to use two backslashes to escape it.

patternURL = new RegExp("http(s)?://www\.facebook\.com(/|/\\?ref=(tn_tnmn|logo)+)?$", "m");

http://jsfiddle.net/tRm7U/8/

This is because when you use the regexp constructor, you use a string, and the first backslash is "used" to escape in the string before the regexp object is constructed. You don't need it if you declare it like this:

patternURL = /http(s)?://www\.facebook\.com(/|/\?ref=(tn_tnmn|logo)+)?$/m

edited Jun 14, 2014 at 13:24

answered Jun 14, 2014 at 13:19

Mosho

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2 Comments

dognose Over a year ago

you still need to provide the "/" in front of "\\?"

lony Over a year ago

Thank you! I now use this "^https?://www\\.facebook\\.com(/(\\?.*)?)?$" which uses your idea.

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