fix(challenges): check for shorthand character in regex

[Nirajn2311]

Description

The regex challenges for checking whitespace, non-whitespace and alphanumeric characters were not checking if the user was using the respective shorthand characters and so the user could pass the challenge without using them.

Pre-Submission Checklist

• [x] Your pull request targets the dev branch.
• [x] Branch starts with either fix/, feature/, or translate/ (e.g. fix/challenge-tests)
• [x] All new and existing tests pass the command npm test.
• [x] Use npm run commit to generate a conventional commit message. Learn more here: https://conventionalcommits.org/#why-use-conventional-commits
• [x] The changes were done locally on your machine and NOT GitHub web interface. If they were done on the web interface you have ensured that you are creating conventional commit messages.

Checklist:

• [x] Tested changes locally.
• [ ] Addressed currently open issue (replace XXXXX with an issue no in next line)

Closes #XXXXX

[scissorsneedfoodtoo]

@Nirajn2311, thank you as always for taking the time to make these changes. Unfortunately, there's no issue, and the prettier formatting makes it a bit difficult to see what changes you actually made to the tests. Could you list the names of the challenges you've updated? Hopefully then we'll be able to QA and merge this quickly.

[Nirajn2311]

@scissorsneedfoodtoo the challenges are:

• Match All Letters and Numbers

• Match Whitespace

• Match Non-Whitespace Characters

Also could you check if I resolved merge conflict correctly.

[scissorsneedfoodtoo]

@Nirajn2311, sorry again for the delay. Thank you for letting me know which challenges you updated. Everything LGTM :+1: :+1: