ptx: Implement context_regex (-S) and its default values

[allan-silva]

The ptx --sentence-regexp=regexp option is not implemented and does not use default values defined by gnu/ptx documentation.

The possible default values for this option includes the new line char, so FileContent should change to not use lines function of BufReader, once \n is not present in line str.

Ref

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Misakait]

I’d like to work on this issue.I’ve already completed the basic framework for implementing context_regex (-S) and integrated the default values according to the GNU ptx documentation.At the moment, I’m working on testing and refining edge cases, such as handling different line endings, empty matches, and ensuring compatibility with the rest of the ptx codebase.
I’ll submit a PR once the tests are stable : -)

[ChrisDryden]

ptx context regex was implemented in the following pr: #9682

Its not 100% gnu compatible yet because it uses the default regex crate that does not have full feature compatibility with the GNU regex but that is being tracked in other issues.