{"content":"I've created an extremely challenging regex problem that incorporates multiple pattern types requiring advanced techniques to match correctly. The text contains a system audit log with valid and invalid identifiers, where only specific valid formats should be matched. This challenge requires:\n\n1. Matching multiple different format types (user IDs and export IDs)\n2. Distinguishing between valid and invalid patterns with subtle differences\n3. Handling mixed formats with different prefixes, delimiters, and structures\n4. Avoiding near-matches and similar patterns that aren't valid\n5. Navigating contextual clues (only items marked [VALID] should be matched)\n\nThe regex solver will need to use techniques like positive/negative lookahead/lookbehind, alternation, precise quantifiers, and character classes to correctly identify only the valid patterns.","function_call":{"name":"make_move","arguments":"{\"reasoning\": \"I've created an extremely challenging regex problem that ... (truncated)