on_change(old_value, new_value)
Donald Trump said they projected the mission to go on for four-five weeks at the beginning, but adds they have ‘capability to go far longer’，更多细节参见51吃瓜
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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.
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key. Because it contains a message