(m4.info) Text handling

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

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* 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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