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  1. or download this
    $ perl -E '
    my $x = qq{ A B\tC # comment};
...
s/[ #]//g:       |AB    Ccomment|
s/[ #]//gx:      |AB    Ccomment|
s/[ #]//gxx:     | A B  C  comment|
  2. or download this
    Unmatched [ in regex; marked by <-- HERE in m/[ <-- HERE  ]/ at -e lin
+e 16.
  3. or download this
    my $re = qr{(?x:
    ... multiline regex pattern here ...
)};