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Hi hdb,
Your solution would not only either set/reset and print the value 'yes' and 'no' for 'A' and 'B', but would also do for subsequent '1' also. And such that either 'yes' or 'no', were printed when the value of '1' is seen.
Though, the OP wanted 'yes' or 'no', for 'A' and 'B'.
So, I added this next if /1/; like so:

for (split //, $string ) { next if /1/; $yes_or_no = $decision{$_} if exists $decision{$_}; print "$_ ($yes_or_no)\n"; }
Though the OP didn't give any information on what he expect when '1' is seen.

If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

In reply to Re^2: Change variable multiple times within a single string? by 2teez
in thread Change variable multiple times within a single string? by JTomb

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