re = /\s*[Cc]:(?:(?:\/|\\{1,2})\w+)+\.\w+/
str = 'C:\\Users\\esteban\\Desktop\\Java_file_testing\\file3.txt
C:/Users/esteban/Desktop/Java_file_testing/file3.txt
C://Users//esteban//Desktop//Java_file_testing//file3.txt
c:\\\\Users\\\\esteban\\\\Desktop\\\\Java_file_testing\\\\file3.txt
'
# 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