How can I verify regular WAF expression syntax and test it for AWS API Gateway?

Question

I have configured a AWS API gateway (GET and POST ) method for pet store project(POC) and have to configure few WAF rules to my below sample JSON structure.

[
{
    "id": 1,
    "type": "dog",
    "price": 249.99
},
{
    "id": 2,
    "type": "cat",
    "price": 124.99
},
{
    "id": 3,
    "type": "fish",
    "price": 0.99
}
]

Now I'm trying to configure a custom AWS WAF rules with the help of Rule builder.

WAF rule 1 : Object Entry count(10)

If JSON body Object Entry count is more than 10+ then WAF custom rule( regular expression ) should block that API request.

I created a regular expression like below :

"[^"]":\s("[^"]"|\d|true|false|null)(,\s*"[^"]":\s("[^"]"|\d|true|false|null)){0,9}

WAF rule 2: Array Entry Count(20) If JSON body Array Entry count is more than 20+ then WAF custom rule should block that API request.

\[([^\[\]]("[^"]")[^\[\]](,\s[^\[\]]("[^"]")[^\[\]]*){0,119})?\]

WAF rule3 : Container Depth(6) JSON body Container Depth is not more than 6. If more, then WAF custom rule should block that API request.

[^\{\}]\{[^\{\}]\{[^\{\}]\{[^\{\}]\{[^\{\}]\{[^\{\}]\}

Now my question is that How can I verify regular expression syntax and test it for above requirements? I feel syntax is wrong, but I'm not sure about this. Can someone please help me to resolve this case?