How to grep 192.168.1.2 IP with port 5241 or 25 or 445?

Input:
192.168.1.1:33
192.168.1.2:5241    
192.168.1.3:22  
192.168.1.2:25
192.168.1.2:80
192.168.1.2:445
192.168.1.2:40

Expected output:
192.168.1.2:5241
192.168.1.2:25 
192.168.1.2:445

CodePudding user response：

You need to use regular expressions. Here's what I came up with:

grep "^192.168.1.2:\(5241\|25\|445\)" input.txt