Hi there, I have problem with writng "\4" into a file, for example, I want to write a string "aaa\4024_folder\mm" into a file test.cfg. But once the string wrote into file, it is "aaa024_folder\mm". So, i do this, string="aaa\4024_folder\mm" string=string.sub(/\\4/,"\\4") the result is the same. I tried string=string.sub(/\\4/,"\\4"), the result is showed a square Any one has any idea to solve the problem? Thank you in advance. -- Posted via http://www.ruby-forum.com/.