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std::basic_string::replace(3) C++ Standard Libarystd::basic_string::replace(3) NAME std::basic_string::replace - std::basic_string::replace Synopsis basic_string& replace( size_type pos, size_type (until count, C++20) const basic_string& str ); constexpr basic_string& replace( size_type pos, (since size_type count, C++20) const basic_string& str ); basic_string& replace( const_iterator first, (un- til const_iterator last, C++20) const ba- sic_string& str ); constexpr basic_string& replace( const_iterator (since first, const_iterator last, C++20) const ba- sic_string& str ); basic_string& replace( size_type pos, size_type count, (until const ba- sic_string& str, C++14) size_type pos2, size_type count2 ); basic_string& replace( size_type pos, size_type count, (since C++14) const ba- sic_string& str, (until C++20) size_type pos2, size_type count2 = npos ); constexpr basic_string& replace( size_type pos, size_type count, (since const ba- sic_string& str, C++20) size_type pos2, size_type count2 = npos ); template< class InputIt > basic_string& replace( const_iterator first, (until const_iterator last, C++20) InputIt first2, InputIt last2 ); template< class InputIt > constexpr basic_string& replace( const_iterator (since first, const_iterator last, C++20) InputIt first2, InputIt last2 ); basic_string& replace( size_type pos, size_type (until count, C++20) const CharT* cstr, size_type count2 ); constexpr basic_string& replace( size_type pos, (since size_type count, C++20) const CharT* cstr, size_type count2 ); basic_string& replace( const_it- erator first, (until const_iterator last, C++20) const CharT* cstr, size_type count2 ); constexpr basic_string& replace( const_iterator (since first, const_iterator last, C++20) const CharT* cstr, size_type count2 ); basic_string& replace( size_type pos, size_type (until count, C++20) const CharT* cstr ); constexpr basic_string& replace( size_type pos, (since size_type count, C++20) const CharT* cstr ); basic_string& replace( const_iterator first, (until const_iterator last, (1) C++20) const CharT* cstr ); constexpr basic_string& replace( const_it- erator (since first, const_iterator last, (1) C++20) const CharT* cstr ); basic_string& replace( size_type pos, size_type (until count, (2) C++20) size_type count2, CharT ch ); constexpr basic_string& replace( size_type pos, (since size_type count, C++20) size_type count2, CharT ch ); basic_string& replace( const_iter- ator first, (until const_iterator last, C++20) size_type count2, CharT ch ); (3) constexpr basic_string& replace( const_iterator (since first, const_iterator last, C++20) size_type count2, CharT ch ); basic_string& replace( (since const_iterator first, C++11) const_iterator last, (4) (until std::initializer_list<CharT> C++20) ilist ); constexpr basic_string& replace( const_iterator (since first, const_iterator last, (4) C++20) std::initializer_list<CharT> ilist ); template < class StringViewLike > (5) (since basic_string& replace( C++17) size_type pos, size_type (until count, C++20) (5) const StringViewLike& t ); template < class StringViewLike > (6) constexpr basic_string& (since replace( size_type pos, C++20) size_type count, const StringViewLike& t ); (6) template < class StringViewLike > (since basic_string& replace( C++17) const_iterator first, (7) (until const_iterator last, C++20) const StringViewLike& t ); template < class StringViewLike > (8) constexpr basic_string& (since replace( const_iterator C++20) first, const_iterator last, const StringViewLike& t ); template < class StringViewLike > (8) basic_string& replace( (since size_type pos, size_type C++17) count, const StringViewLike& (until t, C++20) size_type pos2, size_type count2 = npos ); (9) template < class StringViewLike > constexpr basic_string& replace( size_type pos, (since size_type count, const C++20) StringViewLike& t, size_type pos2, size_type count2 = npos ); Replaces the part of the string indicated by either [pos, pos + count) or [first, last) with a new string. The new string can be one of: 1) string str; 2) substring [pos2, pos2 + count2) of str, except if count2==npos or if would extend past str.size(), [pos2, str.size()) is used. 3) characters in the range [first2, last2). This overload has the same effect as overload (6) if InputIt is an (until C++11) integral type. This overload only participates in overload resolution if InputIt (since C++11) qualifies as an LegacyInputIterator. 4) characters in the range [cstr, cstr + count2); 5) characters in the range [cstr, cstr + Traits::length(cstr)); 6) count2 copies of character ch; 7) characters in the initializer list ilist; 8) characters of a string view sv, converted from t as if by std::basic_string_view<CharT, Traits> sv = t;. These overloads par- ticipate in overload resolution only if std::is_convertible_v<const StringView- Like&, std::basic_string_view<CharT, Traits>> is true and std::is_convert- ible_v<const StringViewLike&, const CharT*> is false 9) subview [pos2, pos2 + count2) of a string view sv, converted from t as if by std::basic_string_view<CharT, Traits> sv = t;, except if count2==npos or if it would extend past sv.size(), [pos2, sv.size()) is used. This overload par- ticipates in overload resolution only if std::is_convertible_v<const StringView- Like&, std::basic_string_view<CharT, Traits>> is true and std::is_convert- ible_v<const StringViewLike&, const CharT*> is false. Parameters pos - start of the substring that is going to be replaced count - length of the substring that is going to be replaced first, last - range of characters that is going to be replaced str - string to use for replacement pos2 - start of the substring to replace with count2 - number of characters to replace with cstr - pointer to the character string to use for replace- ment ch - character value to use for replacement first2, last2 - range of characters to use for replacement ilist - initializer list with the characters to use for re- placement t - object (convertible to std::basic_string_view) with the characters to use for replacement Return value *this. Exceptions * std::out_of_range if pos > length() or pos2 > str.length() * std::length_error if the resulting string will exceed maximum possible string length (max_size()) In any case, if an exception is thrown for any reason, this function has no effect (strong exception guarantee). (since C++11) Example // Run this code #include <cassert> #include <cstddef> #include <iostream> #include <string> #include <string_view> std::size_t replace_all(std::string& inout, std::string_view what, std::string_view with); std::size_t remove_all(std::string& inout, std::string_view what); void test_replace_remove_all(); int main() { std::string str{"The quick brown fox jumps over the lazy dog."}; str.replace(10, 5, "red"); // (5) str.replace(str.begin(), str.begin() + 3, 1, 'A'); // (6) std::cout << str << "\n\n"; test_replace_remove_all(); } std::size_t replace_all(std::string& inout, std::string_view what, std::string_view with) { std::size_t count{}; for (std::string::size_type pos{}; inout.npos != (pos = inout.find(what.data(), pos, what.length())); pos += with.length(), ++count) { inout.replace(pos, what.length(), with.data(), with.length()); } return count; } std::size_t remove_all(std::string& inout, std::string_view what) { return replace_all(inout, what, ""); } void test_replace_remove_all() { std::string str2{"ftp: ftpftp: ftp:"}; std::cout << "#1 " << str2 << '\n'; auto count = replace_all(str2, "ftp", "http"); assert(count == 4); std::cout << "#2 " << str2 << '\n'; count = replace_all(str2, "ftp", "http"); assert(count == 0); std::cout << "#3 " << str2 << '\n'; count = remove_all(str2, "http"); assert(count == 4); std::cout << "#4 " << str2 << '\n'; } Output: A quick red fox jumps over the lazy dog. #1 ftp: ftpftp: ftp: #2 http: httphttp: http: #3 http: httphttp: http: #4 : : : Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 1323 C++98 several overloads of replace use iterator use const_iterator and not const_iterator LWG 2946 C++17 string_view overload causes ambiguity in avoided by making it a some cases tem- plate See also regex_replace replaces occurrences of a regular expression with for- matted (C++11) replacement text (function template) replace replaces all values satisfying specific criteria with another value replace_if (function template) http://cppreference.com 2022.07.31 std::basic_string::replace(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Example | Output: | See also
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