(m4.info)Text handling

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11 Macros for text handling

There are a number of builtins in `m4' for manipulating text in various
ways, extracting substrings, searching, substituting, and so on.

* Len
Calculating length of strings
* Index macro
Searching for substrings
* Regexp
Searching for regular expressions
* Substr
Extracting substrings
* Translit
Translating characters
* Patsubst
Substituting text by regular expression
* Format
Formatting strings (printf-like)

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