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function::strpos − Returns location of a substring within another string
strpos:long(s1:string,s2:string)
s1
string to search in
s2
substring to find
This function returns location of the first occurence of string s2 within s1, namely the return value is 0 in case s2 is a prefix of s1. If s2 is not a substring of s1, then the return value is −1.
tapset::string(3stap)