constexpr bool
contains( CharT ch ) const noexcept;
constexpr bool
contains( const CharT* s ) const;
Checks if the string contains the given substring. The substring may be one of the following:
1) A string view sv (which may be a result of implicit conversion from another std::basic_string).
2) A single character ch.
3) A null-terminated character string s.
All three overloads are equivalent to return find(x) != npos;, where x is the parameter.
std::basic_string ch - a single character s - a null-terminated character string [edit] Return value
true if the string contains the provided substring, false otherwise.
[edit] Notes [edit] Example#include <iomanip>
#include <iostream>
#include <string>
#include <string_view>
#include <type_traits>
template<typename SubstrType>
void test_substring(const std::string& str, SubstrType subs)
{
constexpr char delim = std::is_scalar_v<SubstrType> ? '\'' : '\"';
std::cout << std::quoted(str)
<< (str.contains(subs) ? " contains "
: " does not contain ")
<< std::quoted(std::string{subs}, delim) << '\n';
}
int main()
{
using namespace std::literals;
auto helloWorld = "hello world"s;
test_substring(helloWorld, "hello"sv);
test_substring(helloWorld, "goodbye"sv);
test_substring(helloWorld, 'w');
test_substring(helloWorld, 'x');
}
Output:
"hello world" contains "hello" "hello world" does not contain "goodbye" "hello world" contains 'w' "hello world" does not contain 'x'[edit] See also checks if the string starts with the given prefix
std::basic_string_view<CharT,Traits>) [edit]
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