Mutations: - `/\b/` -> `/\B/` (closes #577) - `/\B/` -> `/\b/` (closes #578) - `/\d/` -> `/\D/` (closes #579) - `/\D/` -> `/\d/` (closes #580) - `/\s/` -> `/\S/` (closes #583) - `/\S/` -> `/\s/` (closes #584) - `/\w/` -> `/\W/` (closes #585) - `/\W/` -> `/\w/` (closes #586)