Question

How to perform string mapping for a value stored in a variable?
Example:
I have my output in a variable say “a”.

set a "a.b12.d4" (its unknown)

Is it possible to use string map to map contents of $a as “\t” in another variable say b?

like,

    set c [string map {"contents of $a" "\t"}$b]   

{I know $a cannot be used here. Is there a way to subtitute contents of $a here in string mapping?}

Answer 1

It is possible if you do not use curly braces as they prevent substitution:

set a "a.b12.d4"
set b "$a.123"
puts [string map [list $a \t] $b]