Re: RFC 165: Allow variables in a tr///

[Mark-Jason Dominus]

> Would there be any interest in adding these two ideas to this RFC:
> 
> 1) tr is not regex function, so it should be regularized to
> 
>    tr(SEARCH, REPLACE, MOD, STR)

MOD should be last, because you're frequently going to want to omit MOD.  

But I think this is worth discussing further, because it neatly
accomplishes the goal of the RFC in a straightforward way:

        tr('a-z', 'A-Z', $str)

replaces a-z with A-Z, and

        tr($foo, $bar, $str)

replaces the characters from $foo with the characters from $bar.
No special syntax is necessary.

People might even stop writing things like

        tr/[a-z]/[A-Z]/

if we did that.