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<?php $strings = [ 'asds asds asdas dasds', 'asdasd asds asd key1:asds', 'asdasd asdsd key2:asdsd asd key1: asdsad', 'asddfs asfasas key2: asds asd key2', // invalid 'asds key3:sdsd asdsad key1:', // invalid 'asds asds asd key1:asdsd key2: assadas asfsaf', 'asdsd aaa:bbb asds', // invalid 'sds asdsad asdsd :asdsd', // invalid ]; foreach ($strings as $string) { var_export([ $string, preg_match( '/^(?: ?(?:\b(?:key1|key2)(?:: *\S+|(*SKIP)(*FAIL))|[^: ]))*$/', $string, $m ) ? $m : 'invalid' ]); echo "\n---\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'asds asds asdas dasds', 1 => array ( 0 => 'asds asds asdas dasds', ), ) --- array ( 0 => 'asdasd asds asd key1:asds', 1 => array ( 0 => 'asdasd asds asd key1:asds', ), ) --- array ( 0 => 'asdasd asdsd key2:asdsd asd key1: asdsad', 1 => array ( 0 => 'asdasd asdsd key2:asdsd asd key1: asdsad', ), ) --- array ( 0 => 'asddfs asfasas key2: asds asd key2', 1 => 'invalid', ) --- array ( 0 => 'asds key3:sdsd asdsad key1:', 1 => 'invalid', ) --- array ( 0 => 'asds asds asd key1:asdsd key2: assadas asfsaf', 1 => array ( 0 => 'asds asds asd key1:asdsd key2: assadas asfsaf', ), ) --- array ( 0 => 'asdsd aaa:bbb asds', 1 => 'invalid', ) --- array ( 0 => 'sds asdsad asdsd :asdsd', 1 => 'invalid', ) ---

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