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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) |