fix: use raw strings for regex patterns in Lesson 6.1 grading

[Maanik23]

Fixes #103

Summary

The REGEX_CATEGORIES dictionary in Exercise 6.1 uses backslash-escaped parentheses (e.g., "A\) P") as regex patterns. Without the r prefix, Python interprets \) as an invalid escape sequence, raising SyntaxWarning in Python 3.12+ and potentially causing DeprecationWarning in earlier versions.

Changes

Added the r (raw string) prefix to all four regex pattern strings in REGEX_CATEGORIES across all three tutorial variants:

# Before
REGEX_CATEGORIES = {
    "A": "A\) P",
    ...
}

# After
REGEX_CATEGORIES = {
    "A": r"A\) P",
    ...
}

Files changed:

• prompt_engineering_interactive_tutorial/Anthropic 1P/06_Precognition_Thinking_Step_by_Step.ipynb
• prompt_engineering_interactive_tutorial/AmazonBedrock/anthropic/06_Precognition_Thinking_Step_by_Step.ipynb
• prompt_engineering_interactive_tutorial/AmazonBedrock/boto3/06_Precognition_Thinking_Step_by_Step.ipynb

Test plan

• Verified all three notebooks have the fix applied
• Fix is consistent across Anthropic 1P, AmazonBedrock anthropic, and AmazonBedrock boto3 variants
• Only the REGEX_CATEGORIES in Exercise 6.1 is affected (Exercise 6.2 uses XML tag patterns which don't need escaping)