Add condition operators for working with regexes.
Review Request #8346 — Created Aug. 25, 2016 and submitted — Latest diff uploaded
This introduces two new operators for matching or not matching against a
user-provided regex. The regex is checked for validity and stored as a
serialized pattern in the condition, and then used to match the given
string during the condition matching process.
BaseConditionStringChoicenow includes these by default. It also adds
the "Does Not Contain" operator, which was missing before.
Unit tests pass.