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](

If you want to lear more about regex, take a look [here ](


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


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


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