For all practical purposes, regular expressions can only be used with the properties #Filename and #Path, and often those will return a "query too expensive" message.
Regular expressions are defined as follows:
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Any character except asterisk (*), period (.), question mark (?), and vertical bar (|), defaults to matching just itself.
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Regular expressions can be enclosed in matching quotes ("), and must be enclosed in quotes if they contain a space () ir closing parenthesis ()).
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The characters *, ., and ? match any number of characters, match (.), or end of string, and match one character, respectively.
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The character | is an escape character. After |, the following characters have special meaning:
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 ( opens a group. Must be followed by a matching ).
) closes a group. Must be preceded by a matching (.
[ opens a character class. Must be followed by an (un-escaped)].
{ opens a counted match. Must be followed by a matching }.
} closes a counted match. Must be preceded by a matching {.
, separates or clauses.
* matches zero or more occurrences of the preceding expression.
? matches zero or one occurrences of the preceding expression.
+ matches one or more occurrences of the preceding expression.
Anything else, including |, matches itself.
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Between square brackets ([]) the following characters have special meaning:
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^ matches everything but in the following classes. Must be the first character.
] matches ]. May only be preceded by ^, otherwise it closes the class.
- range operator. Preceded and followed by normal characters.
Anything else matches itself (or begins or ends a range at itself).
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Between curly braces ({}) the following syntax applies:
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|{m|} matches exactly m occurrences of the preceding expression. (0<m<256).
|{m|} matches at least m occurrences of the preceding expression. (1<m<256).
|{m,n|} matches between m and n occurrences of the preceding expression, inclusive. (0<m<256, 0<n<256).
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To match *, ., and ?, enclose them in brackets (for example, [*]sample, will match *sample.
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