A Regular Expression, commonly referred to as regexes, can be used to build custom rules that are more advanced. Regexes need to conform to a strict syntax to ensure that they are well understood when they are evaluated. If you find yourself using this advanced form of rule matching, make sure you are familiar with how they are constructed.

We use perl style rules for pattern matching. If you are interested, you can read more on the basic syntax we support, here.

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