Regular expression for some format

Question

1.00/5 (1 vote)

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C#6.0

Hi All,

I want to write Regular Expression for below formats.

Note - It should not accept 0 or alpha-bates.

Quote:
8.5
8.52
100000
2000000
0.85

What I have tried:

I have tried so many combination. but no luck.

Quote:
(?

Posted 20-Apr-22 23:44pm

Member 11052432

Updated 21-Apr-22 0:20am

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Richard Deeming · Accepted Answer · 2022-04-21T00:14:00

Solution 1

Simple:

RegEx

^[-+]?\d+(\.\d+)?$

.NET Regular Expressions | Microsoft Docs[^]

But depending on your requirements, it would probably be simpler to use decimal.TryParse to test whether the string is a valid number.

Edit: Excluding zero is slightly more complicated - a zero-width positive lookahead assertion is probably the simplest option:

RegEx

^[-+]?(?=.*[1-9])\d+(\.\d+)?$

Grouping Constructs in Regular Expressions | Microsoft Docs[^]

Again, if your intention is to validate a numeric input, then it would be better to use decimal.TryParse combined with any range checks on the resulting number.

Posted 21-Apr-22 0:14am

Richard Deeming

Updated 21-Apr-22 21:27pm

v2

Comments

CPallini 21-Apr-22 7:45am

5.

Maciej Los 21-Apr-22 10:59am

5ed!

Member 11052432 22-Apr-22 3:12am

Hi Thanks for the solution.

However it's accepting 0 & 0.00 as well like below format.

0 - should not accept
0.00 - should not accept

0.85 - should accept
anything > 0 - should accept
8.5 - should accept
8.52 - should accept
100000 - should accept
2000000 - should accept
0.85 - should accept

Can you please provide regular expression for above formats?

Thanks in advance.

Patrice T · Accepted Answer · 2022-04-21T00:20:00

Quote:
I have tried so many combination. but no luck.

It should not be a matter of luck, but a matter of learning and practicing.

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[^]