How to type a regular expression

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What to type in the ValidationExpression field in the RegularExpressionValidator control so that the user cannot type the "," character more than once.

What I have tried:

i looking for in the forum, but i don't find yet

Posted 6-Dec-20 7:40am

Łukasz Szeszycki

Updated 6-Dec-20 8:27am

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PIEBALDconsult 6-Dec-20 15:58pm

No more than one total? Or not more than one in a row?

2 solutions

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Dave Kreskowiak · Answer 1 · 2020-12-06T08:08:00

Solution 1

Google for "Expresso 3" and download it. It's a great tool for building RegEx expressions.

Posted 6-Dec-20 8:08am

Dave Kreskowiak

Patrice T · Answer 2 · 2020-12-06T08:27:00

Just a few interesting links to help building and debugging 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[^]
RegExr: Learn, Build, & Test RegEx[^]
Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript[^]
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.[^]
This site also show the Regex in a nice graph but can't test what match the RegEx: Regexper[^]