Clean up syntaxes

[SpencerIsGiddy]

[0-9] mean the same thing as \d and {1,} mean the same thing as +

[bhanupratapys]

First let me set up a small dumb test to check regex syntax changes, then we can rebase and merge this 😅

[bhanupratapys]

You will have to resolve the conflicts. Suggested regex will work, but i didn't implement in https://github.com/dnswarden/blocklist-staging/pull/43