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11 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.

• Calculating length of strings
• Searching for substrings
• Searching for regular expressions
• Extracting substrings
• Translating characters
• Substituting text by regular expression
• Formatting strings (printf-like)