Substrings are extracted with substr:
substr(string, from, opt length)
which expands to the substring of string, which starts at index from, and extends for length characters, or to the end of string, if length is omitted. The starting index of a string is always 0.
substr(`gnus, gnats, and armadillos', 6) =>gnats, and armadillos substr(`gnus, gnats, and armadillos', 6, 5) =>gnats
The builtin macro substr is recognized only when given arguments.
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