AIR CARRIER FLT CREW MISTAKENLY PROGRAMMED AND FLEW THE FILED ROUTE RATHER THAN THE AMENDED CLRNC RECEIVED IN THE PDC.

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LEAVING HOUSTON THE RELEASE SAID SEE FILED ROUTE. WHEN I OBTAINED THE PDC CLEARANCE; I CONFUSED THE DASHED ROUTE PORTION AS BEING THE OLD CLEARANCE. SEEING THE SEE FILED ROUTE ON THE RELEASE; I MISTAKENLY ENTERED THE ROUTING ON THE RELEASE UP TO THE ./. (AS FILED) SYMBOL. ON SHOLS DEPARTURE WHEN WE TURNED TOWARD LCH WE WERE ADVISED THAT OUR CLEARANCE WAS TO DRAGS THEN HRV SJI AS FILED. WE CONTINUED TO DRAGS AND PER ATC'S ROUTING. BECAUSE THIS REROUTING IS RARE TO ME; I ACCIDENTALLY FLIP FLOPPED THE MEANING OF THE -REROUTE- (DASHED PORTION) TO BE THE OLD CLEARANCE. ALSO HAVING THE ./. (AS FILED) NOTATION FURTHER LED ME TO BELIEVE THE PRIOR (UNDASHED) ROUTING WAS THE CORRECT CLEARANCE SINCE CLEARANCE DELIVERY USUALLY GIVES YOU THE REROUTE THEN AS FILED (./.). THE SEE FILED ROUTE NOTATION ON THE RELEASE ALSO MADE ME FEEL THAT THE RELEASE SHOWED THE NEW DEPARTURE. IT WOULD HELP IF THERE IS ANY WAY TO OMIT THE INCORRECT CLEARANCE ON THE PDC OR IF NOT; REPLACE THE DASHES WITH OTHER PHRASEOLOGY SUCH AS REROUTE. ALSO; WE FOUND NO INFORMATION OF THE ABOVE IN THE FOM.