fix(utils): add missing re import for start_index parsing helpers

[GeYugong]

Summary

• add missing import re in pageindex/utils.py
• fix potential runtime error in:
  • get_first_start_page_from_text
  • get_last_start_page_from_text

Why

These helpers call re.search / re.finditer, but re was not imported, which can raise NameError when the
functions are used.

Scope

Minimal fix only, no behavior change beyond preventing the runtime error.

[Copilot]

Pull request overview

This PR fixes a runtime error by adding the missing import re statement in pageindex/utils.py. The functions get_first_start_page_from_text and get_last_start_page_from_text were using re.search and re.finditer respectively without importing the re module, which would cause a NameError when these functions are called.

Changes:

• Added import re to the import section of pageindex/utils.py

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[BukeLy]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

The fix is correct: re is used at lines 276 and 284 (re.search, re.finditer) but was never imported, so this would cause a NameError at runtime. The added import re resolves this. The EOF newline fix is also appropriate.

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