regular expression that will take a-z and A-Z 0-9 and underscore and dash

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i am making a username field in windows form.
i have find many regex but result is not good.
I have find this regex ^[a-z0-9_-]{3,16}$
which is taking value between 3 character to 16 characters. But it is not taking uppercase letter.
I am not a regex guru. Niether i added that code in my given regex.
Can anyone help me out

thanks in advance

Posted 29-Sep-12 18:18pm

sariqkhan

Updated 29-Sep-12 18:23pm

Kenneth Haugland

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Kenneth Haugland · Accepted Answer · 2012-09-29T18:20:00

Solution 1

How about:
[a-zA-Z0-9_-]

Take a look at this too:
Expresso - A Tool for Building and Testing Regular Expressions[^]

Posted 29-Sep-12 18:20pm

Kenneth Haugland

Comments

sariqkhan 30-Sep-12 0:27am

thanks bro. For helping
: )

sariqkhan 30-Sep-12 0:33am

is there any thing to check whether - or underscore are at the end of the line? I want to avoid that username which have underscore or dash at end.

Kenneth Haugland 30-Sep-12 0:44am

^[a-zA-Z0-9_-]{3,16}[^_]$

sariqkhan 30-Sep-12 0:52am

this will matches the patters that there is underscore at end?

Kenneth Haugland 30-Sep-12 0:57am

It will match if ther is NO underscore at the end the ^ inside the [] means not...

ridoy 30-Sep-12 1:26am

right

sariqkhan 30-Sep-12 1:34am

but bro it is taking special characters
like * + = how can i avoid that