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You can use regular expressions in all text fields.
There is an implied '.*' at the beginning and end of the regular expression, so the pattern can match anywhere in the field. If you want the pattern to match only at the beginning of the field, start it with '^'. If you want the pattern to match only at the end of the field, end it with '$'. For example, the field 'foo@baz.com' would be matched by the patterns 'baz', '^foo', 'com$', and '^foo@baz.com$'.
'.+' can be used match a non-empty field.
'^$' can be used match an empty field.
Matches are case-sensitive.
Matching the Host name is very slow as it requires DNS lookups.