Some imp informatica links to helps you in flat file scenarios:----
http://informaticachamp.blogspot.in/2014/03/scenario-16-how-to-handle-comma-in.html
http://etllabs.com/informatica/handling-multiple-delimiters-in-a-source-file/2027/
http://www.folkstalk.com/
http://informaticachamp.blogspot.in/2014/03/scenario-16-how-to-handle-comma-in.html
http://etllabs.com/informatica/handling-multiple-delimiters-in-a-source-file/2027/
http://www.folkstalk.com/