How do I allow only numbers for a text box field and not any whitespaces

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i've text box and i need to allow only numbers, using ^[0-9]+$ this particular regex expression will not work perfectly, because, if we enter only white spaces in the textbox field it'll validate, and page.isvalid becomes true, how is this possible
this is happening asp.net 4, .net4 framework

What I have tried:

have tried ^[^/s][0-9]+$ but no desired result

Posted 14-Mar-17 1:46am

Member 12677894

Updated 14-Mar-17 2:09am

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2 solutions

Solution 2

Not a solution, but a couple of links that I find useful about RegEx:

Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]

Posted 14-Mar-17 2:09am

Patrice T

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Jochen Arndt · Accepted Answer · 2017-03-14T02:02:00

Solution 1

This has been asked before and the solution can be found in the net:
c# - RegularExpressionValidator not firing on white-space entry - Stack Overflow[^].

Posted 14-Mar-17 2:02am

Jochen Arndt