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  1. or download this
    use strict;
my $string = "foobar1";
...
baz(bar)(
blah(foo)
(.)$
  2. or download this
    foo(((: invalid regex
(fo(o))(bar): matched: foo o bar
...
baz(bar)(: invalid regex
blah(foo): didn't match
(.)$: matched: 1