(m4.info)Quoted strings

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3.2 Quoting input to 'm4'
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A quoted string is a sequence of characters surrounded by quote strings,
defaulting to '`' and ''', where the nested begin and end quotes within
the string are balanced.  The value of a string token is the text, with
one level of quotes stripped off.  Thus

     `'
     =>

is the empty string, and double-quoting turns into single-quoting.

     ``quoted''
     =>`quoted'

   The quote characters can be changed at any time, using the builtin
macro 'changequote'.  Note: Changequote, for more information.