CODEWITHSUNDEEP
c#.netregex
Erez
Erez

Reputation: 6446

Regex expression does not work

why does the code below insert an item to the groupCollection even though "aaa" does not contain 12 digits in a row ? 

var groupCollection = Regex.Match("aaa", "\\d{12}").Groups

i'm trying to check if a string contains 12 digits in a row like this:

_def_201208141238_aaaa

Upvotes: 1

Views: 80

Answers (3)

Santosh Panda
Santosh Panda

Reputation: 7341

            // Option 1
            // If you are sure there could be only one match then you can check this boolean flag.
            var isSuccess = Regex.IsMatch("aaa", "\\d{12}");

            // Option 2
            // There could be multiple matches.
            var matchCollection = Regex.Matches("aaa", "\\d{12}");

            foreach (Match m in matchCollection)
            {
                // Process your code for each match
            }

Upvotes: 0

Damith
Damith

Reputation: 63065

var match=Regex.Match("_def_201208141238_aaaa", "\\d{12}");


if(match.Success)
{
    // string contains 12 digits in a row
}

Upvotes: 3

outcoldman
outcoldman

Reputation: 11832

The Match method always need to return something. And it returns match object with success value false. I guess you want to use Matches and get the MatchCollection. In this case you should get 0 matches.

Upvotes: 0

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