(m4.info.gz) 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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