re = /filename[^;=\n]*=(?:(\\?['"])(.*?)\1|(?:[^\s]+'.*?')?([^;\n]*))/i
str = 'attachment; filename=content.txt
attachment; filename*=UTF-8\'\'filename.txt
attachment; filename="EURO rates"; filename*=utf-8\'\'%e2%82%ac%20rates
attachment; filename=EURO rates; filename*=utf-8\'\'%e2%82%ac%20rates
attachment; filename="omáèka.jpg"
attachment; filename=\\"omáèka.jpg\\"
attachment; filename*=iso-8859-1\'en\'%A3%20rates
attachment; filename=EXAMPLE- I\'m ößä.dat; filename*=iso-8859-1\'\'EXAMPLE-%20I%27m%20%F6%DF%E4.dat
Content-Disposition: attachment; filename*=UTF-8\'\'0004-1-002-01-datasheet.pdf;'
# 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