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

Game history:
Turn 1: o3-mini - (high) proposed text with target items: ["john_doe+alert@example-mail.com","sophie.o'reilly@sub.domain.co.uk","+1 (202) 555-0143","+44 20 7946 0958","2023-12-31","31/12/2023","15.09.2023","A1B2-A1B2"]
Current turn: 1 of 10
You are the SOLVER.

Your opponent has provided the following challenge:

Text: "----- START CHALLENGE -----
Section 1: Emails
  Valid emails:
    • john_doe+alert@example-mail.com
    • sophie.o'reilly@sub.domain.co.uk
  Invalid examples (should NOT match):
    • john..doe@example.com
    • jane_doe@.com

Section 2: Phone Numbers
  Valid phone numbers:
    • +1 (202) 555-0143
    • +44 20 7946 0958
  Invalid examples:
    • 1234567890
    • (555) 123-4567

Section 3: Dates
  Valid dates (different separators allowed):
    • 2023-12-31
    • 31/12/2023
    • 15.09.2023
  Invalid examples:
    • 2023/12/31
    • 15-09-2023

Section 4: Serial Code with Backreference
  Valid serial:
    • A1B2-A1B2
  Invalid serial (mismatched repetition):
    • A1B2-B2A1

Additional Noise:
  Random strings: X7Y3, sample_text, 99-incorrect
----- END CHALLENGE -----"

You need to create a regular expression pattern that matches EXACTLY these items in the text:
[
  "john_doe+alert@example-mail.com",
  "sophie.o'reilly@sub.domain.co.uk",
  "+1 (202) 555-0143",
  "+44 20 7946 0958",
  "2023-12-31",
  "31/12/2023",
  "15.09.2023",
  "A1B2-A1B2"
]

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.