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run code in 150+ php & hhvm versions
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<?php $text = "Some test text string with stop-words: stw stw2 stopword stw3stw stopword2c"; $stopwords = array( 'stw', 'stopword' ); $regexp = '/'; $regexp.= '(' . implode('|', $stopwords) . ')' . '/'; var_dump($regexp);
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(16) "/(stw|stopword)/"