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<?php $search = 'The'; $replace = 'A'; $subject = "The Quick Brown Fox Jumps Over The Lazy Dog's Thermos!"; echo preg_replace( '/.*\K\b' . preg_quote($search, '/') . '\b/i', $replace, $subject );
Output for git.master, git.master_jit, rfc.property-hooks
The Quick Brown Fox Jumps Over A Lazy Dog's Thermos!

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