Macros for text handling ************************ There are a number of built-ins in `m4' for manipulating text in various ways, extracting substrings, searching, substituting, and so on. * Menu: * 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)