re = /^(\S+) (?=(?s:.)*?\1.*).*/m
str = 'wsmith jul/12/12
bwillis jul/13/13
wsmith jul/14/12
bwillis jul/13/13
tcruise jul/12/12
wsmith jul/14/12
tcruise jul/12/12
'
# Print the match result
str.scan(re) do |match|
puts match.to_s
end
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html