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REGULAR EXPRESSIONS in C#

Posted on 2006-07-06
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Last Modified: 2011-09-20
Hello...could some1 plz tell me the regular expression to extract numbers from text files in C#. Number could be of any size with commas occuring at different positions. A few examples of the number formats could be as follows
500,000,000
56,000
430,064

i have tried for a week with diff expressions  and am not getting it,
thx
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Question by:jhav1594
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8 Comments
 
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by:bpmurray
ID: 17051768
Try one of these:

1. Optional minus sign value from 0 to 999,999,999 with option decimal places
      Regex rx = new Regex(@"-?(\d{1-3},){0-2}\d{1-3}(\.\d+)?");

2. Same as the above, but with no minus sign:
      Regex rx = new Regex(@"(\d{1-3},){0-2}\d{1-3}(\.\d+)?");

3. Same as #2 but no decimals:
      Regex rx = new Regex(@"(\d{1-3},){0-2}\d{1-3}");

You use it like:

        MatchCollection matches = rx.Matches(text);
        foreach (Match match in matches)
        {
             [process the matching string]
        }


 
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LVL 15

Expert Comment

by:bpmurray
ID: 17051784
Just thinking about it - this regexp will allow numbers like 123,456,7 which isn't what you want, so the expression should be:

       "((\d{1-3},){0-2}\d{3})|(\d{1.2})"
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Author Comment

by:jhav1594
ID: 17052613
hey thanks...but this isnt working for me.....it didnt match up...any ideas what mite be going wrong...
thx
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LVL 15

Accepted Solution

by:
bpmurray earned 1000 total points
ID: 17053261
I must have been asleep when I did that  - apologies!

Regex rx = new Regex(@"((\d{1,3},){0,2}\d{3})|(\d{1,2})");
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