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c:\@Work\Perl\monks>perl -wMstrict -le
"$_ = '+++1223w3433.45+34***';
...
B: 12 digit grps.;  s/// string unchanged '+++1223w3433.45+34***'
C: 12 digit grps.;  s/// string unchanged '+++1223w3433.45+34***'
D: 12 digit grps.;  s/// string CHANGED '+++'