regular expressions

^ start of line
$ end of line


Find lines starting with Vlan and select to the end of the line
^Vlan.*$

Find lines starting with Vlan and select the next line also
^Vlan.*[\r\n].*[^\r\n].*


Finding switch ports that are admin down and
^GigabitEthernet.*down,.*[\r\n].*[^/r/n]output\s\d.*

Find an IP group

(\d{1,3}\.\d{1,3}.\d{1,3}\.\d{1,3})

First group is called $1, second is $2 etc

In sublime we can to find

(\d{1,3}\.\d{1,3}.\d{1,3}\.\d{1,3})

replace

insert something $1

that would find 

192.168.0.1

replace 

insert something 192.168.0.1

Find

(Printer)

Replace 

set address $1