Question

lua string.find函数使用说明求教:a1,b1,c1=string.find(a,b,c),这个a1,b1,c1,a,b,c分别表示什么

Answer 1

string.find (s, pattern [, init [,
plain]])
Looks for the first match of pattern 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 numerical 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.