You mean like this?
$VERBOSE = true
str = "Hello world"
# get first capture
str.slice(/Hello (.*)/, 1) #=> "world"
str[/Hello (.*)/, 1] #=> "world"
/Hello (.*)/.match(str)[1] #=> "world"
/Hello (.*)/ =~ str; $1 #=> "world"
# one dimensional array
/(.*) (.*)/.match(str).captures #=> ["Hello", "world"]
···
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