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<?php $e = array( ' ', ' <a href="/stores/locator" class="store-search" id="nav-find-store" tabindex="0"><span>find store</span> </a>', ' ', ' <ul class="nav-overlay" role="group">', ); var_dump(preg_grep('/nav-find-store/', $e));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { [1]=> string(109) " <a href="/stores/locator" class="store-search" id="nav-find-store" tabindex="0"><span>find store</span> </a>" }

preferences:
232.94 ms | 406 KiB | 322 Q