Yes, a complete regex validation is possible.
Most modern regex implementations allow for recursive regexpressions, which can verify a complete JSON serialized structure. The json.org specification makes it quite straightforward.
$pcre_regex = '
/
(?(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* )
)
A (?&json)
/six
';
It works quite well in PHP with the PCRE functions . Should work unmodified in Perl; and can certainly be adapted for other languages. Also it succeeds with the JSON test cases.
Simpler RFC4627 verification
A simpler approach is the minimal consistency check as specified in RFC4627, section 6. It's however just intended as security test and basic non-validity precaution:
var my_JSON_object = !(/[^,:{}[]0-9.-+Eaeflnr-u
]/.test(
text.replace(/"(\.|[^"\])*"/g, ''))) &&
eval('(' + text + ')');
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