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  1. or download this
            Input              Output
        ---------------------------------------
...
        'a|abc'            'a(bc)?'
        'a|ab|abc'         'a(b(c)?)?'
        'a1|a2|a3'         'a[123]'
  2. or download this
            /that|this|thinks|thirst|three/

     -> /th(at|i(?:(?:nk)?s|rst)|ree/   ?
     -> /th(?:at|is|inks|irst|ree)/     ?
     -> /th(?:at|i(?:nk)?s|irst|ree)/   ?