Text Modification Program (With GUI)

I don't know what language this should be in, so I just added different ones as tags. So I need a text modification program that will work on windows and that can handle fairly large text files if needed. The input file will always be items, one per line, each will have a colon in between. The program needs to modify the item after the colon, the item before it should never be modified at all. This is a sample of what an input will look like: John:monkey123 Thomas:123456 Bob:dragon Steve:Knight44 Each time it says "add number range" - I need it to add a range of numbers, there will be a box to add what I want. If I say "1-3" it will add numbers "1", "2" and "3" to the end. By default I want there to be "1" as a placeholder and I can edit it if I want to. Here are the modules: REMEMBER: NEVER MODIFY WHAT COMES BEFORE THE COLON, ONLY WHAT COMES AFTER. Everything below refers to only modifying what comes AFTER the colon. Add number range: Adds a range of numbers that I type. By default, "1" should appear when selected. If the desired range is simply a single number like "1", it will be this: Input: John:monkey Bob:dragon Output: John:monkey1 Bob:dragon1 Capitalize first letter: This capitalizes the first letter Input: John:monkey123 Bob:dragon Output: John:Monkey123 Bob:Dragon IF SOME LINES HAVE NO NUMBERS, example: "Thomas:123456", then remove those lines. Capitalize first letter and add number range: This does the same thing above, but also adds a number range in addition to capitalizing the first letter in the same way I described before Input: Joe:smart Dan:hahaha Output: Joe:Smart1 Dan:Hahaha1 IF SOME LINES HAVE NO NUMBERS, example: "Thomas:123456", then remove those lines. Make all letters lowercase: This makes all letters lowercase. IF SOME LINES HAVE NO NUMBERS, example: "Thomas:123456", then remove those lines. Input: John:Monkey4 Tom:DRAGON123 Output: John:monkey4 Tom:dragon123 Make all letters lowercase and add number range: This does the same as above, but adds a range of numbers. Remove all numbers Simple, just removes all numbers. If there are only numbers like "Tom:123456" then remove the line entirely. Remove all numbers and add number range Same as above but just with adding a number range. Remove all numbers and capitalize first letter Same as above but just capitalizing the first letter. REMEMBER: Each module should take the input on it's own and then the next module also takes the input and applies the modifications. I DO NOT want it to keep piling onto each modification. At the end, it all should be combined together and all duplicate lines (case sensitive) should be removed. For example if my input was: John:Dragon123 Bob:Monkey5 And I applied "Make all letters lowercase" and "Remove all numbers", the output would be: John:dragon123 Bob:monkey5 John:Dragon Bob:Monkey ^ Notice that each module got applied separately and then combined at the end. I need it to do this and then remove duplicate lines if there are any (case-sensitive) I will post a crudely drawn image of what I want: [login to view URL] Thank you and let me know if you have any questions :) I don't care about looks, this just needs to be functional!