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Thankyou. This was extremely helpful.
One further question. Do you know of any legitimate, non-error uses of heavily backtracking regexes that cannot be better expressed using less stack hungry varients?
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
In reply to Re^2: What perl operations will consume C stack space?