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        不区分大小写的 std::string.find()

        Case insensitive std::string.find()(不区分大小写的 std::string.find())

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                  本文介绍了不区分大小写的 std::string.find()的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!


                  I am using std::string's find() method to test if a string is a substring of another. Now I need case insensitive version of the same thing. For string comparison I can always turn to stricmp() but there doesn't seem to be a stristr().

                  I have found various answers and most suggest using Boost which is not an option in my case. Additionally, I need to support std::wstring/wchar_t. Any ideas?


                  You could use std::search with a custom predicate.

                  #include <locale>
                  #include <iostream>
                  #include <algorithm>
                  using namespace std;
                  // templated version of my_equal so it could work with both char and wchar_t
                  template<typename charT>
                  struct my_equal {
                      my_equal( const std::locale& loc ) : loc_(loc) {}
                      bool operator()(charT ch1, charT ch2) {
                          return std::toupper(ch1, loc_) == std::toupper(ch2, loc_);
                      const std::locale& loc_;
                  // find substring (case insensitive)
                  template<typename T>
                  int ci_find_substr( const T& str1, const T& str2, const std::locale& loc = std::locale() )
                      typename T::const_iterator it = std::search( str1.begin(), str1.end(), 
                          str2.begin(), str2.end(), my_equal<typename T::value_type>(loc) );
                      if ( it != str1.end() ) return it - str1.begin();
                      else return -1; // not found
                  int main(int arc, char *argv[]) 
                      // string test
                      std::string str1 = "FIRST HELLO";
                      std::string str2 = "hello";
                      int f1 = ci_find_substr( str1, str2 );
                      // wstring test
                      std::wstring wstr1 = L"ОПЯТЬ ПРИВЕТ";
                      std::wstring wstr2 = L"привет";
                      int f2 = ci_find_substr( wstr1, wstr2 );
                      return 0;

                  这篇关于不区分大小写的 std::string.find()的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!



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