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Editorial Team
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Asked: 2026-06-11T23:00:50+00:00

Suppose I check whether a string match a regex with wildcard. How can I

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Suppose I check whether a string match a regex with wildcard. How can I programatically get extract which substring replaces the wildcard?

Simple example: the regex is "[foo|bar].*\.txt" and say, a matching string that is found is “foo123.txt”. In this case the answer I want is “123”, since it is the substring that replaces the wildcard. If a matching string is bar0123456789.txt, then the answer is 0123456789.

I use c#, but I wouldn’t mind answers in other languages that I can also implement in c#

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1 Answer

  1. Editorial Team

    Don’t use square brackets, if you want a group. Square brackets create a character class.

    What you want is a non capturing group for that:

    (?:foo|bar).*\.txt

    To get the result from the .* (. is a special character that matches any character, but Newline characters (by default) and * is a quantifier that repeats the previous character 0 or more times), you need to put it into a capturing group.

    (?:foo|bar)(.*)\.txt
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