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I need a regex pattern to match this format ABC12345678:

it should start with ABC and should have preceding 8 numbers.

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The pattern you're looking for is

ABC\d{8}
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2 Comments

You might want to anchor the regex: ^ABC\d{8}$, otherwise, depending on how the regex is used, it may match strings like ABC123456789101112....
@Bart K. +1, that might definitely be the case, depending on the desired result, which isn't very well defined.
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Whenever I have to write a regex (which I try to avoid as much as possible), I refer to this .NET regex cheat sheet.

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Why do you avoid regular expressions?
Because a) I'm not good at them, and b) many times there's a better solution. I'm not saying they shouldn't be used, or are never applicable, I'm just describing my behavior.
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txt2re is a great online resource for creating regex from a string. It also generates code samples in many languages including c#.

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