I've constructed a regex that combines all target items with alternation (|) to match exactly the specified strings. For each item:

1. XML/HTML tags: Escaped quotes and special characters in attributes
2. Math expressions: Captured the exact subscript and superscript characters
3. Internationalized domains: Included both Punycode and Unicode versions
4. JWT tokens: Matched the exact tokens but stripped the trailing characters as they appear in the targets
5. Semantic versions: Captured the specific version strings with build metadata
6. ISO timestamps: Matched the exact timestamp format with microseconds and offsets

I've carefully escaped special regex characters like brackets, parentheses, plus signs, etc. to ensure they match literally. I've also made sure to escape quotes and backslashes correctly within the XML attributes.