capturing group not working in Regex

Using regex, I want to match the following strings:

January 25
Jan 25

I'm capturing month and date parts separately but want to return only the first 3 characters of month name if there's full month name, so I'm using non-capturing group (?:) for the characters "uary":

(?<M>(Jan(?:uary)?)) (?<D>dd)

Unfortunately, the group M always returns full month name; ie it captures the non-capturing group too.

I have already turned on ExplicitCapture flag. I've used both RegExBuilder and Rad Software's Regular Expression Designer to make sure it is not because of the tool.

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Your capturing group should surround only Jan .

(?<M>Jan)(?:uary)? (?<D>d{1,2})

Your original expression is roughly equivalent to (?<M>January|Jan) (?<D>dd) . The non-capturing group does not mean that the match is removed from existing capturing groups. It means only that no new capturing group is created.

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尝试：

(?<M>Jan)(?:uary)? (?<D>dd)

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