If you want to remove line breaks or other characters from Oracle fields, the following article might help.

One scenario is for example export of data into text files.

SQL

translate(' example ', chr(10) || chr(13) || chr(09), ' ') 

The above will replace all line breaks (chr(10)), all tabs (chr(09)) and all carriage returns (chr(13)) with a space (' ').

The Oracle function 'translate' is applied on the whole String and might show better performance than regular expressions depending on the complexity of your regex.

Enjoy.