name-based parameter binding

I wrote 'name-based parameter binding' for DBI.
name-based placeholder is /\?(\w+)\?/

EXAMPLE:
  params = { :key1 => "foo", :key2 =>
"bar" }
  # ex1
  dbh.execute("SELECT * FROM table WHERE key1=?key1?
and key2=?key2?",params)
  # ex2 equivalent ex1
  dbh.execute("SELECT * FROM table WHERE key2=?key2?
and key1=?key1?",params)
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Sorry, A correct patch is here.
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