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<?php if (preg_match_all("/\bgallery-\b/i", "PHP [gallery-1].", $matches, PREG_OFFSET_CAPTURE)) { print_r($matches); } else { echo "A match was not found."; }
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [0] => Array ( [0] => gallery- [1] => 5 ) ) )

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