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10. Macros for text handling

There are a number of builtins in m4 for manipulating text in various ways, extracting substrings, searching, substituting, and so on.

10.1 Calculating length of strings  
10.2 Searching for substrings  
10.3 Searching for regular expressions  
10.4 Extracting substrings  
10.5 Translating characters  
10.6 Substituting text by regular expression  
10.7 Formatted output  Formatting strings (printf-like)


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