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<?php $re = '/([A-Z][a-z]*)(\d*[-+]?)/'; $str = 'K+ Cr7+ O2-'; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); print_r($matches);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [0] => K+ [1] => K [2] => + ) [1] => Array ( [0] => Cr7+ [1] => Cr [2] => 7+ ) [2] => Array ( [0] => O2- [1] => O [2] => 2- ) )

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