JavaScript RegEx字符串结尾不起作用

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?

Answer 1

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