re = /^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/m
str = 'me@too.dk
me.too@meee.dk
me,too@meee.dk
me.too@meee,dk
me-too@meee.dk
me.too.tt@meee.dk
me.too@meee.uk.dk
me.too@meee.co.dk'
# 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