Restrict characters allowed in text input object

You can restrict what characters a learner may type into a text input object.

• When a learner types a disallowed character, the keystroke is ignored. In other words, the character will not appear in the input field.
• No characters will be blocked if you leave the Allowed Character property blank; its default state.

There are two ways to restrict characters:

1. Type all characters that ARE allowed into the Allowed Character window. In the example below, only the uppercase letters ABCD will be allowed. All other keystrokes will be ignored.
   
2. You can use RegExp (Regular Expression) syntax to save time specifying what characters are allowed. Here are some examples of syntax you can use.

Regex expression	Description
a-zA-Z	Allows all letters of the alphabet in lower and upper case. All other characters, such as spaces, numbers, and symbols, are ignored.
a-zA-Z0-9	Allows all letters of the alphabet in lower and upper case and all whole numbers.
a-zA-Z0-9-	Same as above, plus negative non-decimal numbers.
a-zA-Z0-9 -	Same as above, plus spaces.