Add some common examples for using Regex with the ReplaceRe and findRE functions

[budparr]

Noting the docs on ReplaceRe don't mention some of the stuff in this thread: https://discuss.gohugo.io/t/replacere-not-working-for-me-solved/5103/3?u=budparr and probably should.

Might be "neat" to add a few more common examples, like for currency, etc. Probably wouldn't be much for some of Hugo's contributors (i.e. not me 😸 ) to come up with a few.

[rdwatters]

I like the idea of expanding on Go's RegEx flavor and am always for more examples.

Last time anything regex-y was brought up was in this thread, which made me question the future of the functions or, at least, how much they should be promoted. Thoughts?

https://github.com/spf13/hugo/issues/3188

[budparr]

That thread seems to me to be saying that replaceRE shouldn't have been used in the example in the docs, not that replaceRE shouldn't be in Hugo.

[moorereason]

replaceRE isn't going away.

[rdwatters]

We can work on the examples later, but I've at least added a note with relevant links: https://github.com/rdwatters/hugo-docs-concept/commit/777f1cefaf9bf8030cdba465d7f11a007d5be370

And live:

https://hugodocs.info/functions/replacere/ https://hugodocs.info/functions/findre/

[moorereason]

Could also mention that https://regex101.com/ has a golang pattern testing mode.