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<?php $re = '/\$\w+\K(?|\h*(\[)\h*(\'[^\']+\')\h*|(\h*\[)\h*("[^"]+")\h*)(?=])/m'; $str = '$foo [ "bar" ], $foo ["bar" ], $foo [ "bar"] $foo [ \'bar\' ], $foo [\'bar\' ], $foo [ \'bar\'] $foo [ \'this is different\' ]'; $result = preg_replace($re, '$1$2', $str); echo $result;
Output for git.master, git.master_jit, rfc.property-hooks
$foo ["bar"], $foo ["bar"], $foo ["bar"] $foo['bar'], $foo['bar'], $foo['bar'] $foo['this is different']

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