Gui Event Handler Exception : Illegal Escape Sequence

Hi,
My application is on Red Hat Linux using QT4.6.3.
I am using a QTreeView with thousands of rows(some times millions of rows are retrieved) with 10 columns of data. One of the columns use RegExps to convert the data from other column. I get the data from internal database.

When i scroll the view up and down fast, I get below exception
Gui Event Handler
Caught exception: 'Illegal escape sequence'

and cannot use the GUI anymore, as i repeatedly get the exception. If i press ok button of exception dialog another exception dialog with the same exception opens up as if in an infinite loop.
I have to kill the application from shell.

Please help me solve this problem
Waiting for reply.

Thanks & Regards,
Subagha