Validate a JSON-like string

Problem

You are given a string s that is intended to be a JSON text. Implement a function isValidJsonStructure(s) -> bool that checks structural validity of the JSON with the following simplified rules:

Rules to validate

1. After ignoring leading/trailing whitespace, the text must start and end with matching outer brackets:
   • either { ... } or [ ... ] .
2. Brackets must be properly nested and balanced :
   • curly braces {}
   • square brackets []
3. JSON strings are delimited by double quotes "..." .
   • While inside a string, any bracket characters ( { } [ ] ) must be ignored for nesting purposes.
   • A quote preceded by an odd number of backslashes is escaped (e.g., \" closes? no; \" contains an escaped quote). In other words, " does not end a string.
4. You do not need to validate JSON key/value grammar (colons, commas, numbers, true/false/null , etc.). Only validate the above structural properties.

Input/Output

• Input: string s
• Output: true if structurally valid per the rules; otherwise false .

Constraints

• 1 <= len(s) <= 1e5

Examples

• "{\"a\":[1,2,3]}" → true
• "{[}]" → false (bad nesting)
• "{\"x\":\"[}\"}" → true (brackets inside a string are ignored)
• "{\"a\":\"unterminated}" → false (unclosed string)