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"And I think that's an advantage that a lot of these people in these boardrooms don't have."
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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.
pony 0.8493 0.8383 -0.0109 0.8286 0.8173 -0.0113