Regular expression

Posted on 2012-04-02
Medium Priority
Last Modified: 2012-04-14
I need a regular validation expression for decimal with % symbol.
Example: 3.245% ,0.000% etc
numbers,dot and % only should be in the expression.

Question by:KavyaVS
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LVL 75

Assisted Solution

by:käµfm³d 👽
käµfm³d   👽 earned 1000 total points
ID: 37795880


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...and if the number to the left of the decimal is optional:


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LVL 31

Assisted Solution

farzanj earned 400 total points
ID: 37795892

If decimals part will always be there:

Assisted Solution

Codecaesar earned 400 total points
ID: 37796277
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Author Comment

ID: 37797473
number to the left of the decimal part and  % symbol is always there.

I tried this one .It is giving me error. unrecognized escape sequence.
"^[\d+(?:\.\d+)?%]".What will be the correct one.

LVL 75

Accepted Solution

käµfm³d   👽 earned 1000 total points
ID: 37797602
It is giving me error. unrecognized escape sequence.
C# requires backslashes within string literals to be escaped. I would suggest, however, using the @ modifier for readability.

"^[\d+(?:\.\d+)?%]".What will be the correct one.
Not that one. With that, all of the following are valid:


You've wrapped your expression in a character class ( [ ... ] ). This means all of the characters listed within the brackets are valid characters.

Here is my previous suggestion corrected for use in code:

string pattern = @"^\d+(?:\.\d+)?%";

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Expert Comment

by:Sanjeev Jaiswal
ID: 37799777
As you said, number to the left of the decimal and % are  always there
which means number left to the decimal, decimal and percentage is always there

i.e. 5.0% or 123.456% or 5.%(assuming) are valid
then try something like this...
use strict;
use warnings;

my $num = "5%";
my $regex = '\d+\.\d*%';

if($num =~ m/$regex/){print "good";}
else{ print "bad";}

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Assisted Solution

by:Vishal Kedar
Vishal Kedar earned 200 total points
ID: 37800315
try below expression.


it may helps.
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 37800318
That's a peculiar syntax for ASP.NET  ; )

Author Closing Comment

ID: 37847456

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