How to write regular expression in C# to accept two digits before decimal and one digit after decimal

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The texbox should allow the user to accept the format like 10.5 or 9.5 , in both case the user should be able to enter only one digit after the decimal point.

Posted 13-Feb-14 1:18am

Member 10593922

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OriginalGriff · Answer 1 · 2014-02-13T01:20:00

Solution 1

Try:

^\d{1,2}\.\d$

Posted 13-Feb-14 1:20am

OriginalGriff

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Member 10593922 13-Feb-14 7:30am

Can you write the complete syntax to add the above line?.

OriginalGriff 13-Feb-14 7:44am

That is the entire syntax of the regular expression.
Are you saying you don't know how to use a regex?

Member 10593922 13-Feb-14 23:31pm

Yes, since am new to C#, i dont know how to use this regular expression in a method

OriginalGriff 14-Feb-14 4:22am

OK - do you know the Regex class?
Regex checker = new Regex(@"^\d{1,2}\.\d$");
if (checker.IsMatch("10.2"))
{
// It's Ok.
}
else
{
// It's bad.
}

Member 10593922 14-Feb-14 5:55am

thank you.

Member 10593922 14-Feb-14 5:58am

Ok now can you please tel me how to display ".0" in textbox by default when the user enters just 10 or 9 .. along with above regular expression

ex: It should be dispalyed as
10.0 or 9.0

OriginalGriff 14-Feb-14 6:02am

Silly question: Are you using Winforms?

Member 10593922 14-Feb-14 6:19am

yes.

OriginalGriff 14-Feb-14 6:21am

Then there is an easier way: don't use a textbox, use a NumericUpDown instead: you can specify the number of decimal places, and the max / min values the user is allowed, and it will handle all the validation for you.
Saves a lot of work!

Member 10593922 17-Feb-14 0:39am

Can u please tell me How to use DataFormatString="{}{0:F1}" in textbox in xaml