Problem Manipulating strings containing reserved characters in PL/SQL block

 I'm attempting to format a text file (32000 lines) so that no line is greater than 80 characters, and have written a pl/sql procedure to do this.

The procedure handles most of the data lines that need to be converted, but not lines like the following:

DELETE=so_chain_detail Upd so_module=D7PRST1_BAT06 so_task_name not_in ('D7PRST1_BAT0006A','D7PRST1_BAT0006B','D7PRST1_BAT0006C')

the pl/sql procedure loads each line of the text file into vc_fileline symbol using a cursor, and the problem seems to be that within pl/sql the following command: