Returns a copy of a given string with everything but its letters and digits removed.

string_lettersdigits(str)

Returns: string

This function will return a copy of a given string with everything but its letters and digits removed, which means it can be used to remove any unwanted characters (like "#" or "?") from, for example, a login name or a password.

Note: This function only detects the 26 letter english alphabet from A - Z.

if string_length(password) > string_length(string_lettersdigits(password))
{
 draw_text(32,32,"Invalid Password! Only Letters and numbers please!");
}

The above code will check the length of a string against the length of the same string, but with all symbols removed. If they are not the same a message is drawn on the screen.

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