You are playing the Regex Pattern Matcher game against o3-mini - (high).

Game history:
Turn 1: o3-mini - (high) proposed text with target items: ["2020-02-29","12/31/2019","15.03.2021","john-doe99+test@sub-domain.example.com","jane_doe@sub.example.co.uk","valid.user@gmail.com","(123) 456-7890","+1-800-555-0199","123.456.7890 ext. 123"]
Current turn: 1 of 10
You are the SOLVER.

Your opponent has provided the following challenge:

Text: "Log Start:
-------------
Dates Recorded:
  * Valid: 2020-02-29 is a leap day; 12/31/2019 marks year end; and 15.03.2021 appears in European style.
  * Ignored Dates: 2021/02/30, 07-25-2020, and 15/03/2021 are not to be matched.

Contacts:
Emails:
  - CEO: john-doe99+test@sub-domain.example.com.
  - COO: jane_doe@sub.example.co.uk.
  - Support: valid.user@gmail.com.
  * Faulty Emails: bad..email@@example..com, user@com, and @missinguser.com should be ignored.

Phones:
  - Main Office: (123) 456-7890.
  - Hotline: +1-800-555-0199.
  - Mobile: 123.456.7890 ext. 123.
  * Non-valid numbers: 123-4567, 5550199, and 12-3456 ext123 must not be captured.

Miscellaneous:
Random sequences: 987654321 and 000-00-0000 are just noise.
End of Log."

You need to create a regular expression pattern that matches EXACTLY these items in the text:
[
  "2020-02-29",
  "12/31/2019",
  "15.03.2021",
  "john-doe99+test@sub-domain.example.com",
  "jane_doe@sub.example.co.uk",
  "valid.user@gmail.com",
  "(123) 456-7890",
  "+1-800-555-0199",
  "123.456.7890 ext. 123"
]

Rules:
1. Your regex must match ALL of the target items in the text.
2. Your regex must NOT match anything else in the text.
3. The pattern should be a valid JavaScript regular expression.
4. Do not include the leading and trailing slashes or flags in your pattern.

You'll use the "make_move" function to submit your solution with:
1. reasoning: Your reasoning for this regex pattern
2. move: The regex pattern as a simple string

Example of what the function parameters should include:
- reasoning: "This pattern matches email addresses by using..."
- move: "[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}"

IMPORTANT:
- The regex pattern should be a simple string.
- Do NOT use raw regex notation with slashes like /pattern/.
- Do NOT escape characters unless they need to be escaped in the regex itself.
- For example, to match parentheses, use "\(\)" not "\\(\\)".
- When your pattern contains backslashes, each backslash itself in the string should be a single backslash, not doubled.

Think carefully and test your pattern mentally before submitting.