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Info Node: (m4.info)Text handling

(m4.info)Text handling


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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.

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)

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