Question

Possible Duplicate:
Get individual query parameters from Uri

I have got a URL like this:

http://somedomain.com/website/webpage.aspx?token=123456&language=English

My goal is to extract 123456 from it. There can only be one payment ID in the query-string parameter. What kind of regular expression can I use? I am using C# (.NET) by the way.

Thanks

Answer 1

token=(\d+) should do the trick

To cater for aplhas as well you can do either:

token=([a-zA-Z0-9+/=]+) to explicitly match on the characters you expect. This matches “token=” and then captures all following characters that match the character class, that is, a-z, A-Z, 0-9, +, / and =.

or

token=([^&#]+) to match any character except for the ones you know can finish the token. This matches “token=” and then captures all characters until the first &, # or the end of the string.