1:2  
-p 1 -t 2 3 
1 2

##</code><code>##

1	arg1
2	arg2
3	arg3

##</code><code>##

{C} > msar in.txt map.txt
Reading mappings from file:  map.txt
----------------------------
arg1:arg2
-p arg1 -t arg2 arg3
arg1 arg2
----------------------------
Mapped 7 entries.

##</code><code>##

($_ =~ s/$replace/$map{$replace}/gi)