Replace first occurrence in Regex.Replace

Question

    string MatchFormat(string subject, string sample, string color)
    {
        if (string.IsNullOrEmpty(sample))
            return subject;

        sample = Regex.Escape(sample);
        return Regex.Replace(subject, sample, m => $"<color={color}>{m.Value}</color>");
    }

I'd like to only replace the first found occurrence of sample with m => $"<color={color}>{m.Value}</color>". How can I do this?

Does this answer your question? Regex.Replace: replace only first one found. There is an overload of this method that will take an integer indicating the max occurrences to replace. regularexpressions — Ryan Wilson
– Ryan Wilson, Commented Oct 7, 2022 at 15:03
The best way to share your solution is not to add it to your question, but to add it as an answer. — Eric J.
– Eric J., Commented Oct 7, 2022 at 15:31
I propose a framing challenge. If you find yourself using Regex to manipulate XML as text you're usually going about it wrong. You should always try and work with structured and parse-able data by parsing it. It's more reliable, can be validated, and is often faster. — Logarr
– Logarr, Commented Oct 7, 2022 at 15:45

Elliot Pixel · Accepted Answer · 2022-10-07 15:35:39Z

1

SOLUTION:

    string MatchFormat(string subject, string sample, string color)
    {
        if (string.IsNullOrEmpty(sample))
            return subject;

        sample = Regex.Escape(sample);
        var r = new Regex(sample);
        return r.Replace(subject, m => $"<color={color}>{m.Value}</color>", 1);
    }

answered Oct 7, 2022 at 15:35

Elliot Pixel

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