Add a solution that enables the direct use of atomic groups #3699
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The catastrophic backtracking solution described where atomic groups are emulated using lookahead and backreferences is useful but can be tricky to use and error prone (e.g. when quantifying the result, or in longer patterns that rely on multiple atomic groups). So this adds a link to an easy to use solution that enables the direct use of atomic groups via
(?>…)
in native JS regexes.