Problem
You need to validate an email address (ie confirm that a given string is actually a valid email address).
Solution
Use a regular expression to check if the email address entered is correctly formatted and return either true or false.
Detailed explanation
Assuming you want to have some textfield validation for an email input in a pure AS3 project or Flash Project (on those where you don't have access to the flex framework's validation functions).
Normally an email address consists of a few standard patterns, you have the @ sign and the domain ending ".com, .net" normally these are all 3 characters long, but you can easily change the code below to accept more then 3 characters.
public class checkEmail
{
public static function check ( s:String ):Boolean
{
var regExpPattern : RegExp =
/^[0-9a-zA-Z][-._a-zA-Z0-9]*@([0-9a-zA-Z][-._0-9a-zA-Z]*\.)+[a-zA-Z]{2,4}$/;
if( mail.match(regExpPattern) == null )
{
return false;
}
else
{
return true;
}
}
}
Then in your own mainclass or frame you just use:
checkEmail(myTextField.text);
For more informations about Regular Expressions, please visit Grant Skinners RegExp Explorer.
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