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Regular Expression for decimal values in an ASP:RequiredFieldValidator

Posted on 2010-08-17
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Last Modified: 2013-12-17
Hi:

I'm not great with regular expressions, so I thought I'd do a post here.

I have an  asp:RequiredFieldValidator on an asp:TextBox.
I want to add a regular expression to validate numeric/decimal values.

So, samples which would match the regex would be:
=====================================

123
123.12
123.00
123
1234
1,234
1,234.00
1,234.56
1234456
1,234,456
1,234,456.00
1,234,456.78

Any help would be greatly appreciated.

Thanks,
JohnB
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Question by:jxbma
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10 Comments
 
LVL 11

Expert Comment

by:bmatumbura
ID: 33455609
Try this:
^(\d|-)?(\d|,)*\.?\d*$

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Expert Comment

by:sybe
ID: 33455619
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LVL 18

Expert Comment

by:Anil Golamari
ID: 33455625
http://www.regexlib.com/Search.aspx?k=decimal&c=3&m=5&ps=20

Here you got a list of regular expression. You can select or customize the expression which were you want to build. So take a look at the above site you even have some expression which you can just copy into your code and you should be good to go.

Good Luck.
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Expert Comment

by:bmatumbura
ID: 33455647
Note: My first post also allows negative numbers and it enforces a comma between groups of 3 digits. Use this to only allow positive numbers and make the comma between digit groups optional: ^(((\d{1,3})(,\d{3})*)|(\d+))(.\d+)?$
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Expert Comment

by:jdavistx
ID: 33455671
I agree with sybe.

You could do something like the attached.  The value of i will only matter if the parse was successful.
int i;
if( Double.TryParse(myValue.ToString(), i) )
	//i now contains the double value of myValue

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Author Comment

by:jxbma
ID: 33456000
I'm going with bmatumbura.
This is client side validation.
Should easily be able to do it with the right regex.

JB
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Author Comment

by:jxbma
ID: 33457130
bmatumbura:

This works fine except for these cases:

1,234
1,234.56
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Expert Comment

by:Carl Tawn
ID: 33458439
It would be a lot simpler just to use a RangeValidator with its Type attribute set correctly.
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Expert Comment

by:Anil Golamari
ID: 33459383
^(\d{1,3},(\d{3},)*\d{3}(\.\d{1,3})?|\d{1,3}(\.\d{3})?)$
try this
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Accepted Solution

by:
jxbma earned 0 total points
ID: 33512971
The best I came up with is:


^[0-9]+(,[0-9]{3})*(\.[0-9]{0,2})*

It works for the following cases:
----------------------------------------
10
10.00
10.10
10.1
100.1
1000.1
123.1
1234.1
1,234.1
10.01
10.
100
101
110
1000
1001
1010
1011
1100
1101
1110
123
123.12
123.00
123
1234
1,234
1,234.00
1,234.56
1234456
1,234,456
1,234,456.00
1,234,456.78
1,234,456.00

Unfortunately, it falsely accepts the following:
---------------------------------------------------------
10.123


But I can live with that for now.
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