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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) |