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.
· 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)