GWT TextBox Regex - regex

Question

I am using GWT textBox and i want it to allow only alpha numeric characters.Is there any example somewhere where i can use the RegExp which is provided in GWT 2.1?
I would like to apply a regex for example ^[a-zA-Z0-9_]*$ .Please provide example code for making this working.Also i cannot use a third party library like the GWT-VL or something like that.
I am using GWT 2.1.
Thanks

Answer 1

You can simply use the matches method of the class String.
Here an example of an email validation:
if(!email.matches("^([a-zA-Z0-9_.\\-+])+#(([a-zA-Z0-9\\-])+\\.)+[a-zA-Z0-9]{2,4}$")) {
setErrorText("wrong mail");
}
Note that email is a String object.

Answer 2

HI you can use GWT-Validator framnework to do this GWT-Validator
Or you can use javascript method through JSNI and the method is mentioned below.
function validate(var string){
var alphanum=/^[0-9a-bA-B]+$/; //This contains A to Z , 0 to 9 and A to B
if(string.match(alphanum)){
return true;
}else{
alert(Put a Valid Userid Name);
return false;
}
}