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  1. or download this
    m[^ \d (?: (?<! \x20 ) \d | \x20 ){19} $]x
  2. or download this
    print m[^ \d (?: (?<!\x20) \d | \x20 ){19} $]x 
    ? 'Yes:' . $_ 
...
Yes:1234512345
 No:123 451 2345
 No: