Broken link to regex lesson

[maneesha]

The wildcards section includes a broken link to an old regex lesson.

[zkamvar]

Note for maintainers: It might be better to remove the reference all together unless we have an equivalent "advanced regexp" that we can point to. The subdomain is v4, which existed between 2010 and 2012.

The earliest internet archive snapshot is from 2016 and contains several broken images and links.

[deppen8]

Perhaps we could replace it with a link to this lesson in the Incubator:
https://carpentries-incubator.github.io/regex-novice-biology/

[bkmgit]

Timings not yet added to the biology lesson, but it does seem helpful.

Maybe the manual is also worth pointing out:
https://www.gnu.org/software/grep/manual/grep.html
https://www.gnu.org/software/grep/manual/html_node/Regular-Expressions.html

May also want to reference ugrep as some people may need additional features such as unicode support.

[gcapes]

I just checked and the link in that section link looks to be working. I guess we can now close this issue, and #1431?

[bkmgit]

Closed the pull request. Maybe helpful to update the text to indicate it points to library carpentry so people are not surprised. There is a related issue for the references section #1451

[maneesha]

It is a valid link now - it was fixed with #1438