Question

I’m trying to create a

 <asp:regularexpressionvalidator>

with following conditions:

• String must be have 8 chars.
• String must contains 8 alphanumeric chars in any order, letters must be capitals.

Eg:

• YES: 12345678
• YES: A2345A78
• YES: ABCDEFGH
• NO: 1234a567
• NO: ABCdEfgh
• NO: abcdefgh
• NO: a.bc-feg

by the way, anyone knows a good regex online creator? Thanks

RESOLVED: For the first answer view the accepted answer, for the second view the first comment of this post by Jeff Turner

Answer 1

For the validator, this will work: [A-Z0-9]{8}. For a plain Regex match, you would need to specify that that should match the whole string, like ^[A-Z0-9]{8}$, but the regex validator already has an extra rule that the whole string must be matched instead of just a part.

Explanation:

• [A-Z0-9] will match any capital letter (A .. Z) and any digit (0 .. 9)
• {8} repeat the previous exactly 8 times