How to check for alphanumeric characters

Question

I\'m writing a custom method for a jQuery plugin:

jQuery.validator.addMethod(\"alphanumeric\", function(value, element) {
        return this.optional(elemen         


        

Answer 1

See test RegExp method.

jQuery.validator.addMethod("alphanumeric", function(value, element) {
        return this.optional(element) || /^[a-zA-Z0-9]+$/.test(value);
}); 

Answer 2

// use below ... It is better parvez abobjects.com
jQuery.validator.addMethod("postalcode", function(postalcode, element) {
    if( this.optional(element) || /^[a-zA-Z\u00C0-\u00ff]+$/.test(postalcode)){ 
         return false;
    }else{ 
         return this.optional(element) || /^[a-zA-Z0-9]+/.test(postalcode); 
    } 

}, "<br>Invalid zip code");



rules:{
  ccZip:{          
           postalcode : true
       },
       phone:{required: true},

This will validate zip code having no letters but alphanumeric

Answer 3

$("input:text").filter(function() {
    return this.value.match(/^[a-zA-Z0-9]+/);
})

Answer 4

You can use regexes in JavaScript:

if( yourstring.match(/^[a-zA-Z0-9]+/) ) {
     return true
}

Note that I used + instead of *. With * it would return true if the string was empty

Answer 5

If you want to use Spanish chars in your alphanumeric validation you can use this:

jQuery.validator.addMethod("alphanumeric", function(value, element) {
    return this.optional(element) || /^[a-zA-Z0-9áéíóúÁÉÍÓÚÑñ ]+$/.test(value);
});

I also added a blank space to let users add words