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    m[
      <%        # Opening delimiter.
...
      )*        # As many non-closing-delims as you like.
      %>        # Closing delimiter.
    ]x

    "<% %%> %>"
    "<%" matches <%
...
        "%" matches [^>] so (?: ... )* has matched twice
         "> " matches [^%]+ so (?: ... )* has matched 3 times
           "%>" matches %> so regex finishes

    "<% %%>"

    m[
      <%        # Opening delimiter.
...
      %*        # PUNT!
      %>        # Closing delimiter.
    ]x