Question

Only the number and alphabet is allowed to be contained in the input string, return true or false.

function is_valid(str:String):Boolean {
}

My implementation is dumb, as I want to iterate each character.

Input: akjd8899kdjfj2kj return: true
Input: kjd^kdjf^%%$ return: false

Answer 1

Do it with a regular expression:

function isValid(value:String):Boolean
{
   var result:String = value.match(/[0-9a-zA-Z]*/)[0];

   return value.length == result.length;
}