Regular expression to capture Pattern followed by '.' charecter in .NET

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Hi All,

I have a pattern that I need to match.
The pattern needs to capture the below matches :-

GOBACK.
GOBACK .
GOBACK

but ignore the match :-
GOBACK123

I have written the regex in Expresso as (\b(GOBACK)\b[.\s]?)\s+ and it works fine there.
But when I use the same in .NET, it is not capturing the first one.
Please help.

Posted 24-Jul-13 19:23pm

Jashobanta

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Sergey Alexandrovich Kryukov 25-Jul-13 1:37am

For future, please keep in mind: giving few examples does not mean comprehensive specification. For example, from your description it's not clear if "GOBACK .", "GOBACK .", "GOBACK .", and so on (different number of spaces), should match or not. It could be figured out from your Regex pattern, but it makes no sense because you claim yourself that it can be mistaken. You really need to be very formal with such questions.
—SA

ArunRajendra 25-Jul-13 1:45am

Can you post your .Net code? I tried the following code and it works.

string s=@"GOBACK.
GOBACK .
GOBACK
GOBACK123
";
Regex r = new Regex(@"(\b(GOBACK)\b[.\s]?)\s+");

MatchCollection m = r.Matches(s);

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-07-24T19:34:00

Solution 1

One bug I can see immediately is: you forgot to escape the dot ('.') using '\.'. The dot needs to be escaped because in Regular Exception it means "any character", not dot.

—SA

Posted 24-Jul-13 19:34pm

Sergey Alexandrovich Kryukov

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Jashobanta 25-Jul-13 6:15am

HI Sergey,

Though I did not see your comment before fixing, but you were right. I modified the end to \\b[\\.\\s] and it worked fine. Thanks everyone.

Sergey Alexandrovich Kryukov 25-Jul-13 10:46am

You are welcome.
If so, will you accept this answer formally (green button)?
—SA

PIEBALDconsult · Answer 2 · 2013-07-24T19:42:00

Solution 2

I think I'd remove the \s+ from the end, but you really haven't explained what you are trying to do.

Posted 24-Jul-13 19:42pm

PIEBALDconsult

Comments

Jashobanta 25-Jul-13 1:46am

Hi,
What I have to do is to capture the matching sequences in the input string for example, in the input
GOBACK.
GOBACK .
GOBACK
GOBACK123

I need to capture only those lines which either contain a dot or a space after the pattern and not to capture those which contain anything other than that.
ie I need to capture only the first three lines but not the last one.

The problem is, in Expresso I am getting exactly 3 matches, but in Visual Studio the same Regex is not capturing a single match.I ran it by removing the \s+ from the end, but still not works.

Sarin VT · Answer 3 · 2013-07-24T20:07:00

I have tried this regEx.

Its working fine with all your test cases.

C#

static void Main(string[] args)
       {
           string text = Console.ReadLine();
           Match match = Regex.Match(text, "\\bGOBACK\\b[\\.\\s]?", RegexOptions.IgnoreCase);

           if (match.Success)
           {
               Console.WriteLine("success");
           }
           else
           {
               Console.WriteLine("Failure");
           }
           Console.ReadLine();
       }

Jashobanta · Answer 4 · 2013-07-25T00:17:00

Solution 4

I changed the expression to

patPrimaryVerb="[\\s]\\b("+primaryVerbList+")\\b[\\.\\s]";

where primaryVerbList contains 'GOBACK' and it worked fine. Thanks everyone for the help.

Posted 25-Jul-13 0:17am

Jashobanta

Regular expression to capture Pattern followed by '.' charecter in .NET

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