Excellent example; but consider use of a character class (see
perlre rather than specifying all 52 lc & uc letters from a to z and the 10 digits from 0 to 9...
[a-zA-Z0-9]
C:\>perl -E "my $s='abcdeEFGHI20130619ABC';$s =~ tr/[b-dB-D2-5]/*/;say
+ $s;"
a***eEFGHI*01*0619A**
update: restating for specificity: 52 uc and lc; 10 digits
update2: choroba points out that (s)quare brackets are not special in tr///; ie, that my suggestion of a char class is wrong -- something illustrated by this:
C:\>perl -E "my $s='abcdeEFGHI20130619ABC';$s =~ tr/b-dB-D2-5/*/;say $
+s;"
a***eEFGHI*01*0619A**
Mea Culpa.
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