Fix include regex to support slash in paths

[Ayushishivhare09]

Fix include regex to support paths with slashes

Problem

The regex for parsing #include statements does not correctly capture paths containing /.

Example:
#include "petsc/finclude/petscvec.h"

was parsed as:
petsc

Solution

Updated regex to include / in the captured path.

Changes

• Fixed regex in regex_patterns.py
• Added test for include paths with slashes

Fixes #481

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.43%. Comparing base (fc68d91) to head (da69164).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #523   +/-   ##
=======================================
  Coverage   44.43%   44.43%           
=======================================
  Files          35       35           
  Lines        4803     4803           
=======================================
  Hits         2134     2134           
  Misses       2669     2669           

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[Ayushishivhare09]

Hi @gnikit,

Just a gentle follow-up on this PR
All checks are passing, and I’ve added a test to cover the reported issue.

As the GSoC 2026 proposal deadline is approaching, I would really appreciate a review whenever you have a moment.

Thanks for your time and guidance — looking forward to your feedback!