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ASP.NET/C#/REGEX: Test if string fits my format

I want to test if a string fits my special format.

[Empty or Number between 1 and 5000]x[Empty or Number between 1 and 5000]

These should all return true:
5000x5000
x250
x
250x
200x123

These should all return false:
abcx123
200
0x100
100x5001

SOLUTION

guru_sami

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SOLUTION

gt2847c

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guru_sami

Aah...didn't test enough...thanks for pointing out.

gt2847c

No problem... I have to do range regex often enough and yours was a lot shorter than I normally do. I had a brief moment when I was thinking, have I been doing this the hard way all long?

guru_sami

Still testing but how does it look now?

^((\s*[1-9]{0,3})|(\s*|5000)|(\s*|[1-4]\d{0,3}))x((\s*[1-9]{0,3})|(\s*|5000)|(\s*|[1-4]\d{0,3}))$

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--Valid
5000x5000
x250
x
250x
200x123
4999x
999x

--Invalid
abcx123
200
100x5001
6000x
900
0x100
600x

kaufmed

Slightly shorter version (give points to gt2847c, though, as upon further inspection it is the same pattern. His generous use of brackets threw me off at first!):

^(5000|[1-4]\d{3}|[1-9]\d\d|[1-9]\d|[1-9])?x(5000|[1-4]\d{3}|[1-9]\d\d|[1-9]\d|[1-9])?$

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gt2847c

guru_sami, your regex still matches 0x, but closer. kaufmed, thx for shortening it. I'll stick that in my bag of tricks. Always useful to learn something better while helping out...

I do a lot of regex with SSIS input validation, so shorter is better =)

ASKER CERTIFIED SOLUTION

kaufmed

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