How to search for and delete single end-of-line text characters.

I have some code that searches for and replaces text but it falls over if it finds a single end of line character.

The problem comes from imported text files (add text > read from file) which have empty lines, after a line of headings for example. The character appears as a small triangle on screen but in Notepad++ it shows as ETX. The snippet of code that has the problem is

                 foreach(text_t l_text
                            if(rexMatchp("^MINIMUM TRACK WIDTH.*$" text_t->text)
                            then    track_xy = text_t->xy
                            axlDeleteObject(text_t)
                            ) ;end if
                         ) ; end foreach

and the error produced is:

E- *Error* rexMatchp: argument #2 should be either a string or a symbol (type template = "tS") - nil

I have tried various attempts with escape characters to cope with this without success,so I was wondering if anyone knows how to make a pass on a particular layer to delete all of these characters if they exist?

Many thanks,