Fastest way to swap selections

Hello all,
I would like to know what are the better/fastest way to swap portions of text. In this case ip address. Imagine I have a dhcp config and want to change a mac address by another:
host printer {
option host-name "epl5900.red-local.net";
hardware ethernet 00:24:2B:65:54:84;
fixed-address 172.16.1.59;
}
host computer {
option host-name "fancylaptop.red-local.net";
hardware ethernet 00:24:2B:65:54:85;
fixed-address 172.16.1.19;
}
What can I do to swap both macs on example?

Thanks.

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