this isn’t just an academic curiosity. flip the alternation order to (ab|a)+ and suddenly PCRE matches the entire string! the | operator in backtracking engines is ordered - it’s not union, it’s “try left first”. the order of branches changes the result, which means | is not commutative. a|b and b|a can give different matches.
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In the meantime, energy companies operating in the Middle East are largely implementing shelter-in-place situations for their employees or even beginning to evacuate families.