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8.3.4 Text processing Macros
The following macros may be used to manipulate strings in M4.
They are not intended for casual use.
— Macro: m4_re_escape ( string)
Backslash-escape all characters in string that are active in
regexps.
— Macro: m4_tolower ( string)
— Macro: m4_toupper ( string)
Return string with letters converted to upper or lower case,
respectively.
— Macro: m4_split ( string, [regexp])
Split string into an M4 list of elements quoted by ‘[’ and
‘]’, while keeping white space at the beginning and at the end.
If regexp is given, use it instead of ‘[\t ]+’ for splitting.
If string is empty, the result is an empty list.
— Macro: m4_normalize ( string)
Remove leading and trailing spaces and tabs, sequences of
backslash-then-newline, and replace multiple spaces and tabs with a
single space.
— Macro: m4_append ( macro-name, string, [separator])
— Macro: m4_append_uniq ( macro-name, string, [separator])
Redefine macro-name to its former contents with separator
and string added at the end. If macro-name was undefined
before (but not if it was defined but empty), then no separator is
added. m4_append can be used to grow strings, and
m4_append_uniq to grow strings without duplicating substrings.
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