re = /^From:\s[A-Za-z]+\s[A-Za-z]+(\s[A-Za-z]+)?(\s[A-Za-z]+)?\s<[A-Za-z]+@domain\.com>/m
str = 'From: FirstName MiddleName Surname <FirstNameMiddleNameSurname@domain.com>'
# 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