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  1. or download this
    perl -Mstrict -W -E 'say $1 if "hello 0 and 123 goodbye" =~ /(\d)+/;'
0
  2. or download this
    $ perl -Mstrict -W -E 'say $1 if "hello and 123 goodbye" =~ /(\d)+/;'
3
  3. or download this
    $ perl -Mstrict -W -E 'say $1 if "hello and 123 goodbye" =~ /(\d+)/;'
123