substr is also an lvalue sub, but its return value can also be magic...

$ perl -lwMstrict
my $x="abcdefghi";
for (substr $x,1,3) {
  print;
  s/c/C/;
  print;
}
print $x;
my $y = \substr $x,5,3;
$$y=~s/g/G/;
print $x;
__END__
bcd
bCd
abCdefghi
abCdefGhi

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In reply to Re^4: regex syntax and idomatic Perl by haukex
in thread regex syntax and idomatic Perl by cbeckley

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