Text Manipulator Site

I would like a website designed in any common format (easily hostable). The aim is to be able to take a list of text words, cut and paste the list into the browser and have the backend website process the list and append extra charters to the list and save them as a new txt file. Similar to what can be done with the unix util awk. I would like the site designed to include a simple logo and lay out. The site must be designed as a pay per view. So the code must also allow for a shopping cart or paid access. More info on request