Regex (RegularExpressionValidator) throgh coding not giving proper output..

Question

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RegularExpressionValidator

RegularExpressionValidator control on TextBox,
[0-9]{0,5}
1) it only allows digits.
2) its length can be upto 5.
In short, v can enter only numeric in text box upto length 5.
Like "87564", "12345ssd" - Valid.
"12k", "4abcd","1234s"- Invalid.

This is how it works of.
But when i try it using coding like..

string strData="5abcd";
if(System.Text.RegularExpressions.Regex.IsMatch(strData, "[0-9]{0,5}"))
{
MessageBox.Show("Valid");
}
else
{
MessageBox.Show("Invalid");
}

This returns Valid.
Which should not be..
Can anybody help!!

Posted 7-Apr-10 18:48pm

Minaxi Sajwan

Updated 11-Apr-10 18:40pm

v4

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2 solutions

Solution 2

[SOLVED]
I got the correct answer.
While using Regex, we should specify the Format as
^[0-9]{0,5}$ instead of only [0-9]{0,5}.
The ^ carrot shows begning match
and $ dollar shows ending match.

Anyways,thanks, OriginalGriff for your reply.

Posted 13-Apr-10 0:49am

Minaxi Sajwan

Updated 16-Apr-10 18:57pm

v2

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OriginalGriff · Accepted Answer · 2010-04-08T06:15:00

I suspect it is working fine.
I assume you want to complain that the Regex.IsMatch(strData, "[0-9]{0,5}") is always returning true?
What did you expect? Of course it will return true (as long as strData is not null)! "there can be 0 to 5 digits in my string" is the clue: zero digits is a pass. So any string which has no (or more) digits in it will pass.