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  1. or download this
    perl -Mre=debug -e"$f = q~a b c~ x 1E4;$g = [split m{\p{IsSpace}}ms, $
    +f ];" 2>2
    
  2. or download this
    Matching REx "\p{IsSpace}" against "1234 1234 1234 1234 1234 1234 1234
    + "
    Matching stclass "ANYOF[{unicode}\11-\15 \302\205\302\240...+utf8::IsS
    +pace]" against "1234 1234 1234 1234 1234 1234 1234 "
    ...
    49980 <1234 > <1234 12>    | 13:  END
    Match successful!
    Matching REx "\p{IsSpace}" against "1234 1234 1234 1234 "