Using regex capture groups in Sublime Text 2 search and replace

gistfile1.md

I copied my .csshrc to a new machine, and needed to add a domain suffix to the hostnames of 20+ VMs in my cluster config. All of my hostnames end in at least 2 digits (foo-bar-baz-01), so I:

1. Search for instances of 2 digits followed by whitespace.
2. Preserve the digits in a capture group.
3. Append the suffix to the capture group (\1)

Append domain suffix where none exists:

Search: ([0-9]{2})\s Replace: \1.my.domain.suffix

Replace domain suffix:

Search: ([0-9]{2})\.my\.old\.domain Replace: \1.my.new.domain