regex engine does not work properly.

[GoogleCodeExporter]

What steps will reproduce the problem?
1. set a regex proxy rule: 
^https?://(?:[^/]+\.)?google[a-z]*\.com(?:\.[a-z]+)?/.*
2. try to visit some google cache, ex: 
http://webcache.googleusercontent.com/search?q=cache:NwBFj2-drvcJ:msdn.microsoft
.com/en-us/library/aa911366.aspx+getlasterror&cd=4&hl=en&ct=clnk&gl=us
3. chrome reports "This webpage is not available"

What is the expected output?
the page should be shown properly.


What do you see instead?
chrome reports "This webpage is not available"

Operating system:
Windows


Error Log:
copy it from "chrome-
extension://caehdcpeofiiigpdhbabniblemipncjj/console.html"
[12:40:25 AM] [success] - Everything is OK


Please provide any additional information below. Attach a screenshot if
possible.
Note: switchy is in "auto switch mode", for this rule and the cache url, 
switchy's icon turned to the color of my proxy.
If I manualy change mode to my proxy, the cache page is shown OK.
That is, I mean, my proxy is working fine.
I'm in China so that I can't visis google web cache directly.

Original issue reported on code.google.com by [email protected] on 20 Sep 2014 at 4:46