refactoring: use stl regex instead of boost::regex

[ursfassler]

Summary

Use standard library regex instead of boost one.

Details

Refactoring to remove no longer needed dependencies.
This removes the support for repeated captures (i.e. boost::regex_constants::match_extra), which may break some use cases. It is expected that such use cases are rare.

Motivation and Context

Less dependencies for functionality that is provided by the standard library.

How Has This Been Tested?

This is a refactoring, it should not change the behavior (expect for repeated captures). All automated tests still work.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist:

• It is my own work, its copyright is implicitly assigned to the project and no substantial part of it has been copied from other sources (including Stack Overflow). In rare occasions this is acceptable, like in CMake modules where the original copyright information should be kept.
• I'm using the same code standards as the existing code (indentation, spacing, variable naming, ...).
• I've added tests for my code.
• I have verified whether my change requires changes to the documentation
• My change either requires no documentation change or I've updated the documentation accordingly.
• My branch has been rebased to main, keeping only relevant commits.