Update test for regex challenge

[newyork-anthonyng]

Pre-Submission Checklist

• Your pull request targets the staging branch of FreeCodeCamp.
• Branch starts with either fix/, feature/, or translate/ (e.g. fix/signin-issue)
• You have only one commit (if not, squash them into one commit).
• All new and existing tests pass the command npm run test-challenges. Use git commit --amend to amend any fixes.

Type of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)
• Add new translation (feature adding new translations)

Checklist:

• Tested changes locally.
• Closes currently open issue (replace XXXX with an issue no): Closes Javascript: Sift through Text with Regular Expressions -- not accepting actual word pattern expression #10989

Description

Add more lenient tests for the "Sift through Text with Regular Expressions" challenge.
Included two new regex for tests:
/\band\b/gi
/(?:\b)and(?:\b)/gi

[dhcodes]

Tested locally and works as described. LGTM 👍 Thanks for contributing to freeCodeCamp 🎉