I'm glad people took the sexeger approach, for which this is an excellent example. Other approaches, like:

• s/two(?!.*two)//, and
• s/two(?!.*?two)//, and
• s/.*two//

suffer from things like slowness and too much backtracking.

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Jeff japhy Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;