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3.2 Quoting input to m4

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.


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