Revert "Clean up regex"

This reverts commit 4047d66c892022fd793f94162069d166ca861477.
Revert "Revert "Clean up regex""

This reverts commit 22916c3eabbd344e093b317f1301063dc870d786.
Revert "Update README.md"

This reverts commit 83d8ac2307c6d19082b3ffe7f2a7721b0934ab0e.