File: m4.info,  Node: Text handling,  Next: Arithmetic,  Prev: Diversions,  Up: Top

11 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.

* Menu:

* 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)