The built-in classified data (e.g., credit card numbers, health data, etc.) uses special algorithms such as Luhn and other techniques. There are no regular expressions used.

However, you can check out this article to learn about some common regex usage. There are also many online articles about regular expressions that you can search for.

Please note that Teramind uses C++ standard for regular expressions. As such, some of the syntax in other standards may not be supported.