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<?php $str= "word1 word2 word3 word4 "; var_export(str_word_count($str, 1, '0..9'));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'word1', 1 => 'word2', 2 => 'word3', 3 => 'word4', )

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