* refactor: replace trivial regex capture group challenge
Previous challenge could be completed without any capture groups. New
challenge requires 3 capture groups and 3 uses of the submatches in the
replacement.
resolves#17645
* test: validate at least 3 capture groups were used
Use solution from SO
(https://stackoverflow.com/questions/16046620/regex-to-count-the-number-of-capturing-groups-in-a-regex)
as suggested by @RandellDawson to count the number of capturing
groups, regardless of whether or not the regex in question solves the
broader problem.
Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com>
* refactor: more meaningful variable name
Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com>
* test: add parenthesized substring test
* test: ensure 3 uses of substring replacement
* refactor: reword instructions
* fix: minor grammar fix
Co-Authored-By: Manish Giri <manish.giri.me@gmail.com>
* refactor: elaborate wording in test
616d96f612