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<?php $re = '/(")([^"]+)(")/'; $str = 'The nice man said "How\'s things today" and I replied "All is good thanks".'; $subst = '<i class="fa fa-quote-left" aria-hidden="true"></i>\\2<i class="fa fa-quote-right" aria-hidden="true"></i>'; echo preg_replace($re, $subst, $str);
Output for git.master, git.master_jit, rfc.property-hooks
The nice man said <i class="fa fa-quote-left" aria-hidden="true"></i>How's things today<i class="fa fa-quote-right" aria-hidden="true"></i> and I replied <i class="fa fa-quote-left" aria-hidden="true"></i>All is good thanks<i class="fa fa-quote-right" aria-hidden="true"></i>.

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