For example, this is the results running the script in a directory containing 10 ktf files.

%,0,N59°3.248' E13°2.656',65.99,2009-09-16 09:51:42,,,$
%,0,N59°3.577' E13°2.460',53.97,2009-09-16 10:05:38,,,$
%,0,N59°3.576' E13°2.462',55.89,2009-09-16 10:07:51,,,$
%,0,N59°3.648' E13°2.924',55.89,2009-09-16 10:14:10,,,$
%,0,N59°3.652' E13°2.937',55.41,2009-09-16 10:19:17,,,$
%,0,N59°3.454' E13°3.092',55.89,2009-09-16 10:25:05,,,$
%,0,N59°3.453' E13°3.467',58.30,2009-09-16 10:31:30,,,$
%,0,N59°3.451' E13°3.466',57.34,2009-09-16 10:36:06,,,$
%,0,N59°3.473' E13°3.605',60.70,2009-09-16 10:39:35,,,$
%,0,N59°3.452' E13°3.467',56.37,2009-09-16 10:42:49,,,$
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The regex pattern stops at newline instead of matching until the end of file. I've tried the m modifier with no luck...

Example: print MYFILE /^(%,0,.*)/ms