cat and grep to omit some unwanted pattern on log file

The app I am debugging is toiled by some crappy domain redirecting output. I was looking for a way clear the catalina out file with some decent message. There is nice tutorial logTail Tutorial tailing the log. For there is a part where pattern omition is there,which worked quite well for me.

cat /usr/local/tomcat/logs/catalina.out | grep -v testing | grep -v url | grep -v

Redirecting This will omit the lines starting with testing Redirecting and url