Thanks Susan, your explanations helps me a lot. :-)

Thanks, Susan .! That's works for me. Just another quick question. how can i do a replacement such that i can preserve next matching line. Sample original Textsnmp-server community public snmp-server password public snmp-server enable traps isdn snmp-server host 172.16.1.27 version 2c public snmp-server host 172.16.1.111 version 1 ...

 Hello: I have several text script files where password is clearly mentioned. Below is just as an example.  I am looking for a regex where I can find the phrase “password” and replace the matching line with some string ex. Password removed. Contact admin at ext 10101 or just wanted to delete line completely. I just ...