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run code in 150+ php & hhvm versions
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<?php if (preg_match("/\bgallery-\b/i", "PHP [gallery-1].")) { echo "A match was found."; } else { echo "A match was not found."; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
A match was found.