[Fix] Resolve regex warnings

[colinthebomb1]

Overview:

This PR fixes a warning in regex expressions by using raw strings for regex expressions. The PR also fixes a warning for unused return statements in ast test cases.

Example warnings:

core/rule_parser.py:238
/home/runner/work/QueryBooster/QueryBooster/core/rule_parser.py:238: DeprecationWarning: invalid escape sequence '\(' 'markerStart': ['\(', '\{', '\['],

tests/test_ast.py::test_complete_query
  /opt/hostedtoolcache/Python/3.10.19/x64/lib/python3.10/site-packages/_pytest/python.py:170: PytestReturnNotNoneWarning: Test functions should return None, but tests/test_ast.py::test_complete_query returned <class 'core.ast.node.QueryNode'>.

Code Changes:

• Used raw strings for regex in rule_parser.py and rule_generator.py
• Removed unused returns in test_ast.py

[Copilot]

Pull request overview

This PR addresses two types of Python warnings in the codebase: DeprecationWarning for invalid escape sequences in regex patterns and PytestReturnNotNoneWarning for test functions returning values. The fixes are straightforward and maintain the same functionality while eliminating the warnings.

Changes:

• Converted regex pattern strings to raw strings (r-prefix) to properly handle escape sequences
• Removed return statements from test functions to comply with pytest conventions

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/test_ast.py	Removed return statements from test functions that were causing PytestReturnNotNoneWarning
core/rule_parser.py	Converted regex patterns to raw strings to fix DeprecationWarning for invalid escape sequences
core/rule_generator.py	Converted regex patterns to raw strings to fix DeprecationWarning for invalid escape sequences

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