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  1. or download this
    use re 'debug';
'foo' =~ m/.*/;
print eval <STDIN>;
  2. or download this
    use re 'debug';
'foo' =~ m/o/;
print eval <STDIN>;
  3. or download this
    use re 'debug';
'foo' =~ m/(?<=f)o(?=o)/;
print eval <STDIN>;