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  1. or download this
    
  DB<19> $foo = 'a=b';
...
  DB<23> x $foo =~/(?:a=([a-z]+))?/;
0  undef
  2. or download this
    /(\d\d\d\d-\d\d-\d\d) .*?(?:a=([a-z]+))?/