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I have a question about restricting the value entered in some input field. I would like to input this :

9digits-whatever, for example 101010101-Teststring.

I have come up with this regex as a solution, but it does not seem to be correct:

^\d{9}\-[a-zA-Z0-9_]*$

Any ideas on this one?

Thank you.

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  • 1
    Just use /^\d{9}-.+$/ Commented Jul 11, 2014 at 14:49
  • Remember that /[a-zA-Z0-9_]/ is exactly /\w/ Commented Jul 11, 2014 at 17:20

2 Answers 2

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The below regex would match 9 digits follwed by - and any number of characters.,

^\d{9}-.*$

If you want a minimum of one character followed by -, then try the below regex.

^\d{9}-.+$

Explanation:

  • ^ Asserts that we are at the beginning of the line.
  • \d{9} Exactly 9 digits.
  • \- Literal - symbol.
  • .* Matches any character zero or more times.
  • $ End of the line.
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5 Comments

Thank you, Avinash Raj, that did it!
IS there any need to escape hyphen?
@Braj but both will work. And op wants to match any character after -.
That's correct but there is no need to escape hyphen. Is it?
Do you know why $ doesn't work as negative [^$]* look up but works if added in the end.
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  • There is no need to escape hyphen -.
  • Use \w that include [a-zA-Z0-9_]

Try below regex if there is only [a-zA-Z0-9_] after 9 digits and hyphen.

^\d{9}-\w*$

Online demo

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2 Comments

OP's $ in this case matches the end of the string, not a literal '$'
@RevanProdigalKnight sorry that part is deleted but $ works in the end but not as part of negative character set.

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