Syntax for regular expression that is a number?

[Mark B]

What would the regular expression syntax be to validate that a field's input
is simply any integer number >=1?

 

[Alexey Smirnov]

What would the regular expression syntax be to validate that a field's input
is simply any integer number >=1?

Mark, here it is: ^\d+$

 

[Hans Kesting]

Alexey Smirnov wrote :

Mark, here it is: ^\d+$

not quite, as that would allow "0", which was not the question.

use: ^[1-9]\d*$
this does not allow leading zeroes or a single zero.

Hans Kesting

 

[Jesse Houwing]

Hello Alexey,

Mark, here it is: ^\d+$

May I remind you that there is a range validator which will be able to check
for type, and values? It's much faster and more maintainable than a regex
in this case.

http://www.w3schools.com/aspnet/control_rangevalidator.asp

Specify:
Type: Integer
MinValue: 1
MaxValue int.MaxValue

 

[Alexey Smirnov]

Alexey Smirnov wrote :

Mark, here it is: ^\d+$

not quite, as that would allow "0", which was not the question.

use: ^[1-9]\d*$
this does not allow leading zeroes or a single zero.

Hans Kesting

Ah, you're right, your pattern is correct, thanks

 

[Juan T. Llibre]

re:
!> Mark, here it is: ^\d+$

I don't think so.

This regex defines "any positive integer number >=1" :

^[1-9]+[0-9]*$

Using ASP.NET's range validator control will make the job easier, though.



Juan T. Llibre, asp.net MVP
asp.net faq : http://asp.net.do/faq/
=========================

What would the regular expression syntax be to validate that a field's input
is simply any integer number >=1?

Mark, here it is: ^\d+$

 

[Andrew Morton]

Alexey Smirnov wrote :

Mark, here it is: ^\d+$

not quite, as that would allow "0", which was not the question.

use: ^[1-9]\d*$
this does not allow leading zeroes or a single zero.

But 007 satisfies the OP's requirement...

Andrew

 

[Mark B]

Thanks all.

Actually we wouldn't want 007. It's just a text field on a page for the user
to enter the number of users they want their software license to cover.

I can't bring myself to put an upper limit on it (e.g. using the range
validator) so I decided to go for ^[1-9]\d*$.

Alexey Smirnov wrote :

What would the regular expression syntax be to validate that a
field's input is simply any integer number >=1?

Mark, here it is: ^\d+$

not quite, as that would allow "0", which was not the question.

use: ^[1-9]\d*$
this does not allow leading zeroes or a single zero.

But 007 satisfies the OP's requirement...

Andrew

 

[Jesse Houwing]

Hello Mark,

Thanks all.

Actually we wouldn't want 007. It's just a text field on a page for
the user to enter the number of users they want their software license
to cover.

I can't bring myself to put an upper limit on it (e.g. using the range
validator) so I decided to go for ^[1-9]\d*$.

If you have a datatype in use (say an int), you will have an upper limit
enforced by the number of bytes...

Just a thought... this regex can cause parsing problems of someone were to
type:

99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

and hit enter...

Jesse

Alexey Smirnov wrote :


What would the regular expression syntax be to validate that a
field's input is simply any integer number >=1?

Mark, here it is: ^\d+$

not quite, as that would allow "0", which was not the question.

use: ^[1-9]\d*$
this does not allow leading zeroes or a single zero.

But 007 satisfies the OP's requirement...

Andrew