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Regular expressions are quite powerful, and there are many options. We use the [https://docs.python.org/3/library/re.html Python Regular Expression] system, and we will document that here. In addition, you can use any Python Regular Expression resource.
Gramps is currently implemented to make all string matching case-insensitive (which is the opposite of the usual default in Python). There is no easy way at present to override this behaviour for the relatively uncommon purpose of matching strings that have been entered into the database in a particular case format. Regular expressions in Gramps currently give identical results regardless of whether the target string is entered in upper case, title case, or lower case.
''whitespace'' - The term "whitespace" is used below to mean one or more character that you don't see. For example, whitespace includes tabs, spaces, and newlines.
