Regular Expression String

Question

I just after some help constructing a regular expression check on the following sequence in C#. I need to ensure the value entered matches the following format.

NNNNCCCCCCCCNNNNNNN

2000AAAAAAAA0001001

Thanks for any help on this

Brendan

You have two group of A-Z and Digits (3, 4), what is their difference? Can I assume [4 Digits][A-Z][7 Digits]? — Quinn
– Quinn, Commented Feb 23, 2016 at 22:39
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– user1517598, Commented Feb 24, 2016 at 23:04

Rob · Accepted Answer · 2016-02-23 22:22:27Z

1

 [0-9]{4}[A-Z]{4}[A-Z]{4}[0-9]{4}[0-9]{3}

If you want to be able to grab each set as a group for processing you need to add ( ) around each pattern.

 ([[0-9]{4})([A-Z]{4})([A-Z]{4})([0-9]{4})([0-9]{3})

This will allow you to recover each set of characters from the match without having to re-parse the string again. If you need that.

Oh and if the first set of digits cannot start with a zero

[1-9][0-9]{3}[A-Z]{4}[A-Z]{4}[0-9]{4}[0-9]{3}

edited Feb 23, 2016 at 22:22

answered Feb 23, 2016 at 22:15

Rob

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2 Comments

Rob Over a year ago

OOPS did not pay enough attention this is for C# :).. fixing it.

PJSCopeland Over a year ago

If you want to allow lower-case letters, use small zs instead of big Zs. Also, does C# allow \d in place of [0-9] like Ruby does?

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