remove unused regexp code

--HG--
branch : nmdc-ircfrontend

typedefs.go

@@ -18,10 +18,6 @@ You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-import (
-	"regexp"
-)
-
 const (
 	VERSION              = "1.0.0"
 	APP_DESCRIPTION      = "nmdc-ircfrontend v" + VERSION
@@ -33,11 +29,6 @@ const (
 	CLIENT_READ_TIMEOUT_SEC = 3
 )
 
-var (
-	nickRegexp    = regexp.MustCompile(`^[a-zA-Z\[\]_^{|}][a-zA-Z0-9\[\]_^{|}]*$`)
-	channelRegexp = regexp.MustCompile(`^#[a-zA-Z0-9_\-]+$`)
-)
-
 type replyCode int
 
 const (