Regex C# with 2 patterns. Possible to know which pattern matched?

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 Regex regex = new Regex(@"a|b");
Match match = regex.Match(line);
 if (match.Success)
{
}

I want to know if the line matched on "a" or "b" .. because based on that result i want to do different things

What I have tried:

my best solution was to split the regex itself

 if (match1.Success)
{
}
if (match2.Success)
{
}

Posted 12-Mar-17 10:22am

Amien90

Updated 12-Mar-17 12:25pm

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OriginalGriff · Answer 1 · 2017-03-12T11:59:00

Solution 2

The other alternative is to use groups: Regular Expression Reference: Capturing Groups and Backreferences[^] I'd use Named groups to make it more obvious:

(?<GroupA>a)|(?<GroupB>b)

That way you can inspect the Regex.Groups property by name and determine which matched.

Posted 12-Mar-17 11:59am

OriginalGriff

Comments

Bryian Tan 12-Mar-17 18:30pm

Nice!!!. I had the same idea and was playing with this concept.

Bryian Tan · Answer 2 · 2017-03-12T12:25:00

Solution 3

Here is an example using GetGroupNames method to capture the group name. At the bottom you can write an if statement, f matchedGroupName == "abc" then ...

reg_multiple C# - rextester[^]

Posted 12-Mar-17 12:25pm

Bryian Tan