Next, we’ll try to examine if the error can be less. If we find any approximations that are better than the worst-case scenario — i.e., that satisfy ε
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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MacBook Air shows a Shapr3D screen featuring a render of an orange pendant lamp.