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  1. or download this
          "foo" =~ m/(oo)/;
          {
            "bar" =~ /(ar)/;
          }
          print $1, "\n";
    
  2. or download this
    $search_string = "123abc";
    
    ...
    
    foo(1);
    
  3. or download this
    123 abc
    456 def
    123 abc
    
  4. or download this
    123 abc
    456 def
    456 def
    
  5. or download this
       "foo" =~ /(oo)/;
       print $1;
    
  6. or download this
          "foo" =~ m/(oo)/;
          {
            "bar" =~ /(ar)/;
          }
          print $1, "\n";
    
  7. or download this
    $search_string = "123abc";
    
    ...
    
    foo(1);