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<?php $string = 'word1&word2 !word3 word4 &word5'; var_export( preg_split('/ |(?<! )(?=[&!])/', $string) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'word1', 1 => '&word2', 2 => '!word3', 3 => 'word4', 4 => '&word5', )

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