Present an example that explains your question. pos() refers to the end of the last global match. Are you asking about any interference between \K and \G? I do not foresee any.

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;