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(m4.info)Changequote

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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.