/
(?(DEFINE)
(?<number> -? (?= [1-9]|0(?!\d) ) \d+ (\.\d+)? ([eE] [+-]? \d+)? )
(?<boolean> true | false | null )
(?<string> " ([^"\\\\]* | \\\\ ["\\\\bfnrt\/] | \\\\ u [0-9a-f]{4} )* " )
(?<array> \[ (?: (?&json) (?: , (?&json) )* )? \s* \] )
(?<pair> \s* (?&string) \s* : (?&json) )
(?<object> \{ (?: (?&pair) (?: , (?&pair) )* )? \s* \} )
(?<json> \s* (?: (?&number) | (?&boolean) | (?&string) | (?&array) | (?&object) ) ) \s*
(?<tag> \@(?:[[:alnum:]])*)
)
(?'actiontag'
(?:\@(?:[[:alnum:]_-])*)
)
(?:\=
(?:
(?:
(?'params_json'(?&json))
)
|
(?:
(?'params'(?:[[:alnum:]_-]+))
)
)
)?
/
ixgm