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  1. or download this
    $temp =~ m/(\[0-9\])blah$1/;
    
  2. or download this
    $temp =~ m/(\[0-9\])blah\1/;
    
  3. or download this
    #!/usr/bin/perl
    
    ...
            print "didn't match\n";
        }
    }
    
  4. or download this
    [0-9]blah[0-9]  matched
    [0-9]blah6      didn't match
    
  5. or download this
    Use of uninitialized value in concatenation (.) or string at ./671663.
    +pl line 8.
    [0-9]blah[0-9]  matched
    [0-9]blah6      matched