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  1. or download this
    my $regex = '\b(?:' . join('|', @nums) . ')\b'; # update: fixed concat
+enation issue
  2. or download this
    my $regex = '\b(' . join('|', @nums) . ')\b'; # update: fixed concaten
+ation issue
  3. or download this
    DB<1> $_ = "oh blah dee"
DB<2> ($x) = m/(blah)/
DB<3> x $x
0  'blah'