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<?php $sentence = "foo_foo_foo foo-foo_foo"; if (preg_match_all("/(?<![^\W_])foo(?![^\W_])/i", $sentence, $matches)) { print_r($matches[0]); } echo PHP_EOL . preg_replace("/(?<![^\W_])foo(?![^\W_])/i", "YES", $sentence);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => foo [1] => foo [2] => foo [3] => foo [4] => foo [5] => foo ) YES_YES_YES YES-YES_YES

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