SubstituteAndReturn: Faster search for contextual s///r, y///r#2
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This uses `each_match_of(Expression)` instead of `each_match_within(Expression)` because `each_match_within()` is only able to find one instance of a contextual substitution or transliteration on each pass because the inner matches did not specify the entire pattern for what an expression can contain.
…ions This reduces the calls to `match_positions_of()` which helps skip most expressions which will not have a `s///` or `y///` in them.
The positions should already be sorted.
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s///r,y///rPerformance
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