https://community.cloudera.com/t5/Support-Questions/ReplaceText-Processor-edit-only-the-header-of-csv-file/m-p/227273#M189133 <P><A rel="user" href="https://community.cloudera.com/users/18929/yaswanthmuppireddy.html" nodeid="18929">@Shu</A> Thank you for your response when I tried this regex expression :</P><PRE>^[!@#$%^&amp;*(),.?":{}|&lt;&gt;]</PRE><P>It changed only the first occurance of a special character. </P><P>I have in input this csv file :</P><P>Name,T&amp;C_Test,Date_of_(Transformation),date_/_of _deliverance</P><P>1,1457,26/12/2016,14/12/2017</P><P>2,4789,18/04/2017,03/09/2018</P><P>I expect an output file like this one:</P><P>Name,TC_Test,Date_of_Transformation,date_of _deliverance</P><P>1,1457,26/12/2016,14/12/2017</P><P>2,4789,18/04/2017,03/09/2018</P> Wed, 27 Jun 2018 16:33:15 GMT AmiraKhalifa 2018-06-27T16:33:15Z