Comment by andrewla

I feel like this is very underspecified, The very first example:

    $ echo 'cat' | trre 'c:da:ot:g'
    dog

Feels strange. What is happening here; the grammar says

    TRRE    <- TRRE* TRRE|TRRE TRRE.TRRE
    TRRE    <- REGEX REGEX:REGEX

What is the parse tree here? Why is "c" not being replaced with "da"? Or why isn't c being removed and "da" being replaced by "ot"?

I do like the idea of having a search/replace semantic that is more intuitive than grouping operators; back in MS-DOS days you could do "ren .log .txt" and this would work which feels bananas to my modern bash-minded way of thinking, but it's very obvious looking at this what it is supposed to do.