9.5.3. string Search Operations
The string class provides six different search functions, each of which has four overloaded versions. Table 9.14 describes the search members and their arguments. Each of these search operations returns a string::size_type value that is the index of where the match occurred. If there is no match, the function returns a static member (§ 7.6, p. 300) named string::npos. The library defines npos as a const string::size_type initialized with the value -1. Because npos is an unsigned type, this initializer means npos is equal to the largest possible size any string could have (§ 2.1.2, p. 35).
Table 9.14. string Search ...
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