Question

I’ve got the following: text.gsub(/(lower) (upper)/, '\1 \2')

Can I make just substitution \2 uppercase?

Something like: sed -e 's/\(abc\)/\U\1/'

Is this possible in Ruby?

Answer 1

see the gsub document:

str.gsub(pattern) {|match| block } → new_str

In the block form, the current match string is passed in as a parameter, and variables such as $1, $2, $`, $&, and $’ will be set appropriately. The value returned by the block will be substituted for the match on each call.

"a lower upper b".gsub(/(lower) (upper)/){|s| $1 + " " + $2.upcase}