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  1. or download this
    echo -e 'zero\none\ntwo\n\n    three'
zero
...
two

    three
  2. or download this
    echo -e 'zero\none\ntwo\n\n    three' | perl -0777 -pe 's{\s*(one\ntwo
+)\s*}{\n\n<begin block>\n\n$1\n\n<end block>\n\n}'
zero
...
<end block>

three
  3. or download this
    echo -e 'zero\none\ntwo\n\n    three' | perl -0777 -pe 's{\s*(one\ntwo
+)\s*?( *)}{\n\n<begin block>\n\n$1\n\n<end block>\n\n$2}'
zero
...


    three