InputMaskRegEx

1. Input Mask Regex

You can mask the uinput of a textbox by using a regular expression.

You can find further information for for the Input Mask itself [here](https://github.com/RobinHerbots/Inputmask)

If you want to lear more about regex, take a look [here ](https://regex101.com/)

Examples:

This allows only non-capital and capital letters (azA-Z) numbers (0-9) and the underscore (_). But no special characters (like ö, &, %, @,...).

^[_0-9a-zA-Z]*$

Example 2. This forces the input to begin with abc, followed by any a-Z0-9

^abc[_0-9a-zA-Z]*$