Looks for the first match of pattern (see ยง6.4.1) in the string s. If it
finds a match, then find returns the indices of s where this occurrence
starts and ends; otherwise, it returns nil. A third, optional numeric
argument init specifies where to start the search; its default value is 1
and can be negative. A value of true as a fourth, optional argument plain
turns off the pattern matching facilities, so the function does a plain
"find substring" operation, with no characters in pattern being considered
magic. Note that if plain is given, then init must be given as well.
If the pattern has captures, then in a successful match the captured values
are also returned, after the two indices.
Looks for the first match of pattern (see ยง6.4.1) in the string s. If it finds a match, then find returns the indices of s where this occurrence starts and ends; otherwise, it returns nil. A third, optional numeric argument init specifies where to start the search; its default value is 1 and can be negative. A value of true as a fourth, optional argument plain turns off the pattern matching facilities, so the function does a plain "find substring" operation, with no characters in pattern being considered magic. Note that if plain is given, then init must be given as well.
If the pattern has captures, then in a successful match the captured values are also returned, after the two indices.