Regex expression for numbers with one decimal points

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Can anyone help me with the regular expression for any number with maximum of 1 decimal point

C#

Valid numbers: 
10
10.2
100015.1
99.9
10.0

Invalid numbers:
10.01
12.333
0.233
10.
10.1<space>
10.<space>

What I have tried:

i tried with below expression but it does not work for (10. , 10.space , 10.1space)

\.\d\d+

Posted 24-Aug-16 22:49pm

Shrikesh_kale

Updated 25-Aug-16 0:02am

Patrice T

v3

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Member 13908363 10-Mar-20 3:06am

how to restrict more than one decimal points ? the user should not write like 5..23
but he can write 5.23

2 solutions

Solution 2

Try to replace \.\d\d+ with \d+\.\d as a start.
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 24-Aug-16 23:15pm

Patrice T

Updated 24-Aug-16 23:18pm

v2

Comments

Member 13908363 10-Mar-20 3:06am

how to restrict more than one decimal points ? the user should not write like 5..23
but he can write 5.23

Patrice T 10-Mar-20 3:24am

Ypu should ask your own question.
add some details .

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OriginalGriff · Accepted Answer · 2016-08-24T23:11:00

Solution 1

Try:

^\d\d+\.[1-9]\d*$

That allows two or more to the left of the decimal point, and at least one on the right.
And allows for 10.01 being invalid.

"I am searching for that allows two or more to the left of the decimal point, and max one on the right."
Then try:

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

Posted 24-Aug-16 23:11pm

OriginalGriff

Updated 24-Aug-16 23:50pm

v2

Comments

Shrikesh_kale 25-Aug-16 5:43am

I am searching for that allows two or more to the left of the decimal point, and max one on the right.

OriginalGriff 25-Aug-16 5:50am

Answer updated

Shrikesh_kale 25-Aug-16 6:21am

thanks

Member 13908363 10-Mar-20 3:06am

how to restrict more than one decimal points ? the user should not write like 5..23
but he can write 5.23

OriginalGriff 10-Mar-20 3:13am

Did you try the regex that has been here for three and a half years?