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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 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
Array ( [0] => Array ( [0] => K+ [1] => K [2] => + ) [1] => Array ( [0] => Cr7+ [1] => Cr [2] => 7+ ) [2] => Array ( [0] => O2- [1] => O [2] => 2- ) )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [0] => Array ( [0] => K+ [1] => K [2] => + ) [1] => Array ( [0] => Cr7+ [1] => Cr [2] => 7+ ) [2] => Array ( [0] => O2- [1] => O [2] => 2- ) )

preferences:
180.28 ms | 402 KiB | 162 Q