Regex expression for 0-100 numbers with eight decimal points

Question

0.00/5 (No votes)

See more:

Can any one please help me with the regular expression for any number from 0 to 100

Valid Number

0
0.00
12.123456
100.00
100

Invalid Number

-10.12
100.11
101

I referred the below link and modified the RegX value like

"^(100|\\d)(\\.\\d{1,8})?$";

for my requirement. But it is not worked out for me. Also, the result is not accurate.

Regex expression for 0-10 numbers with two decimal points[^]

What I have tried:

I tried this RegX .

"^(100|\\d)(\\.\\d{1,8})?$";

But, not worked for me

Posted 28-Jun-22 3:31am

Udhaya Bharathi

Updated 28-Jun-22 8:43am

Add a Solution

Comments

PIEBALDconsult 28-Jun-22 9:42am

Untested, and not fully awake yet -- ^((100)|(\d{1,2}(\.\d{1,8})?))$

CHill60 28-Jun-22 10:01am

Tested for you - it works. Definitely a solution to post

CHill60 28-Jun-22 10:03am

Looking at the way you have just thrown some extra \ characters in there, you might find this link useful Regex Cheat Sheet[^]

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2022-06-28T05:02:00

Solution 1

Piebald's solution:

((100)|(\d{1,2}(\.\d{1,8})?))

Isn't quite right - it doesn't detect "100.00" as a valid number, and on some systems it assumes that (100) is a numbered capture group.
Try this:

^(?<whole>100|\d{1,2})(?<fract>\.\d{1,8})?$

If you want to work with regexes, get a copy of Expresso[^] - it's free, and it examines and generates Regular expressions.

Posted 28-Jun-22 5:02am

OriginalGriff

v2

Comments

CHill60 28-Jun-22 11:09am

Good spot - I missed that test case when I checked it and suggested Piebald posted it

OriginalGriff 28-Jun-22 11:21am

Easy to miss it! That's half the problem with testing regexes ... :sigh:

Udhaya Bharathi 28-Jun-22 12:01pm

Thanks for your solution. I am using this RegX while entering value in TextBox. But If I type value 10. then this condition is failed. So, I can't enter decimal values.

TextBox txtBox = (TextBox)sender;
string regx = "^(?<whole>100|\\d{1,2})(?<fract>\\.\\d{1,8})?$";
if (!Regex.IsMatch(txtBox.Text.Trim(), regx))
{
//Throws error
}
If you have any idea on this, please share

Udhaya Bharathi 28-Jun-22 12:06pm

Result:
Regex.IsMatch("10.5", regx)
true
Regex.IsMatch("10.", regx)
false // <= It should be true
Regex.IsMatch("101", regx)
false
Regex.IsMatch("100", regx)
true

OriginalGriff 28-Jun-22 14:09pm

You need to learn how regexes work if you are going to use them: none of your examples end with a period, so it wasn't considered as valid by either Piebald or myself.
To allow it, you need to reduce the minimum number of digits allowed after the period from one to zero. If you have understood the examples we gave you, you should be able to change that very easily.

PIEBALDconsult 28-Jun-22 14:32pm

100.99 ?

OriginalGriff 28-Jun-22 14:51pm

Works for me ... does it not work for you?

PIEBALDconsult 28-Jun-22 18:25pm

Won't yours accept it rather than reject it?

OriginalGriff 29-Jun-22 0:42am

Yes ... and on second thoughts, you're probably right it should be rejected.
an exercise for the OP then ...
Not a difficult mod!

Patrice T · Answer 2 · 2022-06-28T08:43:00

I would try something like : ^100(\.0{1,8})?|\d{1,2}(\.\d{1,8})?$
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[^]