🧪 Add comprehensive tests for AdvancedSearch.regex_search

[dioncx]

🎯 What: The testing gap in json_memory/search.py's AdvancedSearch.regex_search method has been addressed by introducing a new dedicated test file, tests/test_search.py.
📊 Coverage: Added specific tests covering all arguments of the method including searching by 'path', 'value', and 'both'. Also includes edge cases such as case-sensitive matching, invalid regex patterns, and when no results are found.
✨ Result: Enhanced code reliability with targeted test cases ensuring robust regex searches.

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PR created automatically by Jules for task 2890845139543934391 started by @dioncx

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