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Temporary databases
my $dbh = DBI->connect('dbi:SQLite:dbname=:memory:'); # in-memory database my $dbh = DBI->connect('dbi:SQLite:'); # temporary database file created in /var/tmp
Defining a REGEXP function
$dbh->func('regexp', 2, sub { return ($_[1] =~ m/$_[0]/) ? 1 : 0; }, 'create_function');