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  1. or download this
    perl -wle '$foo = "a hello w"; $foo = $foo =~ s/(?=.*(hello)).*/$1/sr;
+ print $foo'
  2. or download this
    hello
  3. or download this
    ...; print $foo =~ s/(?=.*(hello)).*/$1/sr;
  4. or download this
    ...; $foo =~ /hello(?{ $foo = $& })/; print $foo