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Editorial Team
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Asked: 2026-05-14T14:56:00+00:00

I want a regex that will verify that a string begins with a letter

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I want a regex that will verify that a string begins with a letter followed by some letters, numbers, or underscores. According to my EditPadPro regex parser the following test should pass. But it does not. 

Regex.IsMatch("Class1_1", @"^\w[\w|\d|_]*$").ShouldBeTrue();

What am I missing?

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1 Answer

  1. Editorial Team

    Your regex works, but doesn’t do what you think it does.

    You should use

    Regex.IsMatch("Class1_1", @"^[A-Za-z]\w*$")

    (Tested)

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