tr equivalent to sed command

[Patrick O'Callaghan]

On Fri, 2012-02-24 at 21:22 +0900, 夜神　岩男 wrote:
> I'm trying to move a script from invoking lots of sed and awk to bash 
> builtins and I'm stumped on something I'm sure is simple.
> 
> Is there a tr equivalent to the following?
[...]

You realize that tr is not a Bash builtin, right?

poc