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

* Menu:

* Len                          Calculating length of strings
* Index                        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)