(m4.info) Changequote

 
 Changing the quote characters
 =============================
 
    The default quote delimiters can be changed with the builtin
 `changequote':
 
      changequote(opt START, opt END)
 
 where START is the new start-quote delimiter and END is the new
 end-quote delimiter.  If any of the arguments are missing, the default
 quotes (``' and `'') are used instead of the void arguments.
 
    The expansion of `changequote' is void.
 
      changequote([, ])
      =>
      define([foo], [Macro [foo].])
      =>
      foo
      =>Macro foo.
 
    If no single character is appropriate, START and END can be of any
 length.
 
      changequote([[, ]])
      =>
      define([[foo]], [[Macro [[[foo]]].]])
      =>
      foo
      =>Macro [foo].
 
    Changing the quotes to the empty strings will effectively disable the
 quoting mechanism, leaving no way to quote text.
 
      define(`foo', `Macro `FOO'.')
      =>
      changequote(, )
      =>
      foo
      =>Macro `FOO'.
      `foo'
      =>`Macro `FOO'.'
 
    There is no way in `m4' to quote a string containing an unmatched
 left quote, except using `changequote' to change the current quotes.
 
    Neither quote string should start with a letter or `_' (underscore),
 as they will be confused with names in the input.  Doing so disables
 the quoting mechanism.
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