Patterns, i.e. regular expressions, used in Tinderbox should use Perl language conventions, as further defined in documentation for the Boost regex code library: https://www.boost.org/doc/libs/1_34_1/libs/regex/doc/syntax_perl.html.
The operators .contains() and .containsAnyOf() now use Apple's regular expression engine rather than the BOOST engine. The change is unlikely to cause problems in working agents, and will provide better results when working with non-Latin characters.
In action codes (or other operators) that are described as using regular expression patterns for their input arguments (i.e. 'patterns'), it may be possible to use the '\xdd' method to define characters in an escaped form such as tricks the first-pass parsing of single/double-quotes in arguments. Thus:
$Text = $Text.replace("XXX","\x22")
…replaces every instance of 'XXX' with a straight double quote character. Reference links: