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<?php $string = "my cat is going to the vet"; $ignore = array("my", "is", "to", "the"); $pattern = "~^[a-z]+|\b(?|" . implode("|", $ignore) . ")\b(*SKIP)(*FAIL)|[a-z]+~"; echo "$pattern\n---\n"; echo preg_replace_callback($pattern, function($m) {return ucfirst($m[0]);}, $string);
Output for git.master, git.master_jit, rfc.property-hooks
~^[a-z]+|\b(?|my|is|to|the)\b(*SKIP)(*FAIL)|[a-z]+~ --- My Cat is Going to the Vet

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