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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 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => Array ( [0] => gallery- [1] => 5 ) ) )
Output for 4.3.0 - 4.3.2
Warning: Wrong value for parameter 4 in call to preg_match_all() in /in/GkLhS on line 3 A match was not found.