Allow for different types of citation key formats in tidy_bib_file() about citr HOT 3 OPEN

Hi, thanks for the feedback. I'm all for supporting your citation key format and I think allowing users to specify custom regex is a great idea! I added the regex in question in response to this issue: #49 Regrettably, it seems I did not implement the problematic keys as unit tests. So as a strategy for a PR, I think it would be great to first create a Rmd file containing a range of different test cases and then adjusting the regex to ensure it catches all cases. This would inform us, about whether the regex you suggest preserves the current functionality and adds the desired flexibility.

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suggested regex as default: "@[^(.|;|,|?|!)\\s\\]\)]+" , adjusted from line 47.

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Not sure I know exactly what you mean, I'm quite new to sharing code, so forgive me for asking rudimentary questions :). i understand making an Rmd and bib with a ton of different keys would be helpful in figuring out the best regex, but would you want me to push these to this repository? Or is there another way to do this (collaboratively) without adding those files to this repo? I can also do the test locally and then push once I find the Ultimate Regex (if that exists).
Thanks!

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