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I have following regex to validate card number

[\d+]{6,6}[X|x]{8,8}[\d+]{4,4}

I want to validate following as valid card number

 123456XXXXxxxx1234

But anything extra then this should not match.

 123456XXXXxxxx1234a bbb123456XXXXxxxx1234nnn

That is these should not match.

I tried this regular expression but it is not working for me.

^[\d+]{6,6}[X|x]{8,8}[\d+]{4,4}$
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  • What isn't working with the second rege,? Commented Feb 6, 2016 at 21:28
  • Yes . With second regex . 123456XXXXxxxx1234 is coming as invalid Commented Feb 6, 2016 at 21:29
  • Are you sure you don't have trailing or leading whitespace? Commented Feb 6, 2016 at 21:30
  • Ohh yes. I have. Thanks for your help. Commented Feb 6, 2016 at 21:31
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    I think you misunderstand how to use character classes. Your [\d+]{4,4} matches 4 digits or plus symbols. I think you just meant \d{4} (4 digits). Right? Also: [X|x]{8,8} matches 8 X, x or | symbols. I guess you need just [Xx]{8}. Commented Feb 6, 2016 at 21:34

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Your [\d+]{4,4} matches 4 digits or + symbols. I think you just meant \d{4} (4 digits). Also, [X|x]{8,8} matches 8 X, x or | symbols. I guess you need just [Xx]{8}.

I believe you need

^\d{6}[Xx]{8}\d{4}$

See regex demo

If you have time, you might want to read more about Character Classes or Character Sets.

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