Regular expressions
You can include one or more regular expressions and evaluate to True if one of these matches the provided value.
You can use a combination of regular expressions by referring to DSL Grammar.
Keyword: regex
A regex that matches everything can be defined as follows:
regex(\"[\\\\s\\\\S]+\")
A regex that includes multiple expressions can be defined as follows:
regex(\"[\\\\s\\\\S]+\",\"^[0-9]*$\")