Regular Expression for Alphanumeric

Question

I have to restrict user's to enter only alphanumeric characters in a text box.

The user must enter both numeric and alphabetical characters.

I have used this [a-zA-Z0-9]+$s regular expression.

Please help me to solve the issue

Vulpes · Answer

If the mean that the name must include at least one alphabetic and at least one numeric character then use this: ^(?=.*\d)(?=.*[a-zA-Z])[a-zA-Z0-9]{2}$

Resmi Satish · Answer

Thanks...

Iftikar Hussain · Answer

Hi Try like this var text = textBox1.Text.Trim(); if (Regex.IsMatch(text @^([A-Za-z][A-Za-z0-9]{2})*$)) { MessageBox.Show(Valid); } else { MessageBox.Show(Invalid); } Regards Iftikar

Sanjeeb Lenka · Answer

use this ^[0-9a-zA-Z ]+$ OR ^[A-Za-z0-9]*$ USING YOUR REGULAR EXPRESSION WHAT PROBLEM YOU ARE GETTING