(m4.info)Text handling

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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.

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)