Regular Expression for alphanumeric and backspace

Question

0.00/5 (No votes)

See more:

I have a textbox that is handled by a keypress. I want the textbox must accept only alphabet, numbers and allowing him to press the backspace.

my regular expression is ([^a-zA-Z0-9])

but the backspace does not work

thanks for any fast reply

THANKS

Posted 28-Sep-10 17:32pm

laupkram

Add a Solution

Comments

AspDotNetDev 29-Sep-10 0:59am

Show us your code... e.g., which event you are using and how you are passing the key to the regular expression.

4 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)

PumbaPumba · Answer 1 · 2010-09-28T19:56:00

Solution 1

May be this could help you.
http://regexlib.com/CheatSheet.aspx[^]

http://stackoverflow.com/questions/4736/learning-regular-expression[^]

Posted 28-Sep-10 19:56pm

PumbaPumba

Abhishek Sur · Answer 2 · 2010-09-28T20:08:00

Solution 2

Backspace generally works for any regex validation as reg validation is invoked for the string.

You can try
http://www.siteexperts.com/tips/functions/ts23/page1.asp[^]

for entire regex list.

:rose:

Posted 28-Sep-10 20:08pm

Abhishek Sur

Hiren solanki · Answer 3 · 2010-09-28T20:18:00

Solution 3

Try by changing this Regex from

[^a-zA-Z0-9]

to

^[a-zA-Z0-9[\b]]

Hope this will work.

Please vote and Accept Answer if it Helped.

Posted 28-Sep-10 20:18pm

Hiren solanki

SLDWorks · Answer 4 · 2010-09-28T20:24:00

I hope you can accept an answer from a vb.net user.

C#

private void TextBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{

    if (char.IsLetter(Strings.ChrW(e.KeyCode)) | Information.IsNumeric(Strings.ChrW(e.KeyValue)) | char.IsControl(Strings.ChrW(e.KeyValue))) {

    } else {
        e.SuppressKeyPress = true;

    }

}