Editor txt Program

We have already have a nicely working txt. text editor, but now we want an additional feature added to it. Either to the editor itself or a separate program. It must be able to shuffle the Word-X and word-Y words into a different order, as in this example: Now: Word-1|text text text text text|Word-2 Word-2|text text text text text|Word-3 Word-3|text text text text text|Word-4 Word-4|text text text text text|Word-5 Word-5|text text text text text|Word-1 After example: Word-5|text text text text text|Word-1 Word-3|text text text text text|Word-4 Word-4|text text text text text|Word-2 Word-1|text text text text text|Word-3 Word-2|text text text text text|Word-5 and so on...............