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Home/ Questions/Q 50953
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Asked: May 10, 20262026-05-10T16:40:27+00:00 2026-05-10T16:40:27+00:00

It seems the .NET Regex.Replace method automatically replaces all matching occurrences. I could provide

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It seems the .NET Regex.Replace method automatically replaces all matching occurrences. I could provide a MatchEvaluator delegate that returns the matched string after the first replacement, rendering no change, but that sounds very inefficient to me.

What is the most efficient way to stop after the first replacement?

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  1. 2026-05-10T16:40:27+00:00Added an answer on May 10, 2026 at 4:40 pm

    From MSDN:

    Replace(String, String, Int32)    

    Within a specified input string, replaces a specified maximum number of strings that match a regular expression pattern with a specified replacement string.

    Isn’t this what you want?

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