Create a custom regex

Question

How can i create a regex that can check for the following:

• can have either http or https
• might have www or not
• must have steamcommunity, .com

• must have either id or profiles followed by numbers or text

  http://steamcommunity.com/id/rasmusvejby/ http://steamcommunity.com/profiles/76561198040893433

Also it should be said that if it contains ID it should check if there are text, and if it conntainns profiles i should check for numbers.

Answer 1

Decription

Given your sample text...

http://steamcommunity.com/id/rasmusvejby/
http://steamcommunity.com/profiles/76561198040893433

...this Regex...

^https?://(?:www.)?steamcommunity.com/(id/([^/s]*)|profiles/([^/s]*))

...will do the following

1. validate the url contains steamcommunity.com
2. matches with or without the leading www
3. Allows http or https
4. captures the id or profile portion of the url
5. captures the string for the id or profile

Capture Groups

• Group 0 gets the full string
• Group 1 gets the (ID or Profiles) and the associated value
• Group 2 gets just the value of the ID
• Group 3 gets just the value of the Profile

Example

Sample matches

[0][0] = http://steamcommunity.com/id/rasmusvejby
[0][1] = id/rasmusvejby
[0][2] = rasmusvejby
[0][3] = 

[1][0] = http://steamcommunity.com/profiles/76561198040893433
[1][1] = profiles/76561198040893433
[1][2] = 
[1][3] = 76561198040893433

Explanation

NODE                     EXPLANATION
----------------------------------------------------------------------
  ^                        the beginning of a "line"
----------------------------------------------------------------------
  http                    'http'
----------------------------------------------------------------------
  s?                       with or without 's'
----------------------------------------------------------------------
  ://                      '://'
----------------------------------------------------------------------
  (?:                      group, but do not capture (optional
                           (matching the most amount possible)):
----------------------------------------------------------------------
    www                      'www'
----------------------------------------------------------------------
    .                       '.'
----------------------------------------------------------------------
  )?                       end of grouping
----------------------------------------------------------------------
  steamcommunity           'steamcommunity'
----------------------------------------------------------------------
  .                       '.'
----------------------------------------------------------------------
  com/                     'com/'
----------------------------------------------------------------------
  (                        group and capture to 1:
----------------------------------------------------------------------
    id/                      'id/'
----------------------------------------------------------------------
    (                        group and capture to 2:
----------------------------------------------------------------------
      [^/s]*                  any character except: '/', whitespace
                               (
, 
, 	, f, and " ") (0 or more
                               times (matching the most amount
                               possible))
----------------------------------------------------------------------
    )                        end of 2
----------------------------------------------------------------------
   |                        OR
----------------------------------------------------------------------
    profiles/                'profiles/'
----------------------------------------------------------------------
    (                        group and capture to 3:
----------------------------------------------------------------------
      [^/s]*                  any character except: '/', whitespace
                               (
, 
, 	, f, and " ") (0 or more
                               times (matching the most amount
                               possible))
----------------------------------------------------------------------
    )                        end of 3
----------------------------------------------------------------------
  )                        end of 1