Customize regular expressions (Patterns) of a form's text box

*If you want a text box in a form to accept only certain values or a certain number of characters, you need to set up a regular expression (Pattern) for each question. This is a very technical topic, so don't be afraid to reach out to our support team if you have any questions.*

The programming language used for patterns is Java.

In this example, we want the form to only accept letters (either uppercase or lowercase):

*Simple examples:*

Now, you'll see a table with commonly used regular expressions (Patterns). You can find a more complete guide here: [Official regular-expression Java Patterns]()

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Updated on: 04/02/2026