{"id":338,"date":"2022-09-26T05:04:41","date_gmt":"2022-09-05T00:27:57","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/c-%e3%81%a7%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%81%ae-find-%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e3%81%a9%e3%81%86%e3%81%97%e3%81%be%e3%81%97%e3%81%9f%e3%81%8b\/"},"modified":"2025-07-31T22:47:41","modified_gmt":"2025-07-31T13:47:41","slug":"c-%e3%81%a7%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%81%ae-find-%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e3%81%a9%e3%81%86%e3%81%97%e3%81%be%e3%81%97%e3%81%9f%e3%81%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c-%e3%81%a7%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%81%ae-find-%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e3%81%a9%e3%81%86%e3%81%97%e3%81%be%e3%81%97%e3%81%9f%e3%81%8b\/","title":{"rendered":"C++ \u3067\u306e\u6587\u5b57\u5217\u306e find() \u306e\u4f7f\u3044\u65b9\u306f\u3069\u3046\u3057\u307e\u3057\u305f\u304b?"},"content":{"rendered":"

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001C++\u3067String\u306efind()\u3092\u3069\u306e\u3088\u3046\u306b\u4f7f\u7528\u3067\u304d\u308b\u304b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u3082\u3057\u6587\u5b57\u5217\u5185\u306b\u5225\u306e\u6587\u5b57\u5217\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u3001std::string.find() \u30e1\u30bd\u30c3\u30c9\u306f\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u3092\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u4ea4\u3048\u3066\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n

\n

C++\u306estring find()\u306e\u69cb\u6587<\/h2>\n

\u3053\u306e\u65b9\u6cd5\u306fC++\u306e\u6587\u5b57\u5217\u30af\u30e9\u30b9\uff08std::string\uff09\u306b\u5c5e\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\u3092\u542b\u3081\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u5225\u306e\u6587\u5b57\u5217\u3092\u5f15\u6570\u3068\u3057\u3066\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u9069\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u305d\u306e\u5f8c\u3001find()\u30e1\u30bd\u30c3\u30c9\u306f\u4e0e\u3048\u3089\u308c\u305f\u6587\u5b57\u5217\u304c\u79c1\u305f\u3061\u306e\u6587\u5b57\u5217\u5185\u306b\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001’\\0′ \u7d42\u7aef\u6587\u5b57\u3092\u542b\u3080\u30b5\u30d6\u30b9\u30c8\u30ea\u30f3\u30b0\u306e\u30b5\u30a4\u30ba\uff08\u30b5\u30a4\u30ba_t\u3067\u8fd4\u3055\u308c\u307e\u3059\uff09\u3002\u3057\u304b\u3057\u3001\u3082\u3057\u6587\u5b57\u5217\u304c\u79c1\u305f\u3061\u306e\u5143\u306e\u6587\u5b57\u5217\u5185\u306b\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u30010\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n

\u305d\u308c\u306b\u3088\u3063\u3066\u3001\u305d\u306e\u95a2\u6570\u306f\u6b21\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002 (Sore ni yotte, sono kans\u016b wa tsugi no y\u014d ni tei shimasu.)<\/p>\n

size_t find<\/span>(<\/span>const<\/span> std::<\/span>string&<\/span> my_string,<\/span> size_t pos =<\/span> 0<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u59cb\u70b9\u3092\u691c\u7d22\u3059\u308b\u305f\u3081\u306e\u8ffd\u52a0\u30d1\u30e9\u30e1\u30fc\u30bfpos\u304c1\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u30010\u3067\u3059\u306e\u3067\u3001\u660e\u793a\u7684\u306b\u958b\u59cb\u4f4d\u7f6e\u3092\u6307\u5b9a\u3057\u306a\u3044\u9650\u308a\u3001\u691c\u7d22\u306f\u6587\u5b57\u5217\u306e\u5148\u982d\u304b\u3089\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n
\u307e\u305f\u3001\u6587\u5b57\u5217\u306fconst\u53c2\u7167\u3067\u6e21\u3055\u308c\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u6587\u5b57\u5217\u3092\u5909\u66f4\u3057\u306a\u3044\u305f\u3081\u3001\u4e00\u6642\u7684\u306a\u6587\u5b57\u5217\u3092\u4f5c\u6210\u3059\u308b\u6642\u9593\u3092\u7121\u99c4\u306b\u3057\u306a\u3044\u3088\u3046\u306b\u3001\u53c2\u7167\u3092\u76f4\u63a5\u64cd\u4f5c\u3059\u308b\u65b9\u304c\u5408\u7406\u7684\u3067\u3059\u3002<\/p>\n
C++20\u4ee5\u964d\u3001\u591a\u304f\u306e\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u30e1\u30bd\u30c3\u30c9\u306fconstexpr\u4e92\u63db\u6027\u3092\u6301\u3064\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002constexpr\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u3055\u3089\u306b\u8a73\u3057\u304f\u8aad\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3044\u304f\u3064\u304b\u306e\u95a2\u6570\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u8a73\u7d30\u306f\u3053\u306e\u30da\u30fc\u30b8\u3092\u53c2\u7167\u3057\u3066\u3044\u305f\u3060\u3051\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u3001\u30b9\u30ad\u30c3\u30d7\u3057\u307e\u3059\u3002\u4ee3\u308f\u308a\u306b\u3001\u30b5\u30d6\u30b9\u30c8\u30ea\u30f3\u30b0\u306e\u9577\u3055\u306b\u95a2\u308f\u308b\u7279\u5b9a\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306b\u7126\u70b9\u3092\u5f53\u3066\u307e\u3057\u3087\u3046\u3002<\/p>\n
size_t find<\/span>(<\/span> const<\/span> Char*<\/span> s,<\/span> size_type pos,<\/span> size_type count )<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u7279\u5b9a\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306f\u3001\u90e8\u5206\u6587\u5b57\u5217\u304c\u6587\u5b57\u5217\u5185\u306b\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u304c\u3001\u540c\u6642\u306b\u90e8\u5206\u6587\u5b57\u5217\u306e\u9577\u3055\u306b\u5236\u9650\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6307\u5b9a\u3055\u308c\u305f\u6570\u306e\u6587\u5b57\u307e\u3067\u4e00\u81f4\u3057\u307e\u3059\u3002<\/p>\n
\u305f\u3060\u3057\u3001\u3053\u308c\u306fstd::string\u306b\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002\u539f\u578b\u306e\u4e2d\u306b\u300cconst Char*\u300d\u304c\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u3053\u308c\u306fC\u30b9\u30bf\u30a4\u30eb\u306e\u6587\u5b57\u5217\u306b\u306e\u307f\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u3053\u306e\u95a2\u6570\u306b\u300cHello\u300d\u306e\u90e8\u5206\u6587\u5b57\u5217\u300cHell\u300d\u3092\u6e21\u3057\u305f\u5834\u5408\u3002<\/p>\n
std::<\/span>cout <<<\/span> \"Hello\"<\/span>.<\/span>find<\/span>(<\/span>\"Hell\"<\/span>,<\/span> 0<\/span>,<\/span> 3<\/span>)<\/span> <<<\/span> std::<\/span>endl;<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u306f\u300cHello\u300d\u306e\u6700\u521d\u304b\u30893\u6587\u5b57\u3060\u3051\u3092\u30de\u30c3\u30c1\u3055\u305b\u308b\u305f\u3081\u3001\u51fa\u529b\u3068\u3057\u3066\u306f5\u30d0\u30a4\u30c8\u3067\u306f\u306a\u304f\u3001\u308f\u305a\u304b4\u30d0\u30a4\u30c8\u3057\u304b\u5f97\u3089\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u3055\u3066\u3001\u5b66\u3093\u3060\u3053\u3068\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\n
C++\u3067string.find()\u3092\u4f7f\u7528\u3059\u308b<\/h2>\n
\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u547c\u3073\u51fa\u3057\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002pos=0\u306e\u5834\u5408\u3001\u6587\u5b57\u5217\u306e\u5148\u982d\u304b\u3089\u5168\u3066\u306e\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22\u3057\u307e\u3059\u3002<\/p>\n
#<\/span>include<\/span> <iostream><\/span><\/span>\r\n#<\/span>include<\/span> <string><\/span><\/span>\r\n\r\nint<\/span> main<\/span>(<\/span>)<\/span> {<\/span>\r\n    \/\/ Create our string<\/span>\r\n    std::<\/span>string my_str<\/span>(<\/span>\"Hello from JournalDev\"<\/span>)<\/span>;<\/span>\r\n    \/\/ Target string to search for<\/span>\r\n    std::<\/span>string target_string<\/span>(<\/span>\"JournalDev\"<\/span>)<\/span>;<\/span>\r\n\r\n    std::<\/span>cout <<<\/span> \"Is \"<\/span> <<<\/span> target_string <<<\/span> \" a substring of \"<\/span> <<<\/span> my_str <<<\/span> \" ?\\n\"<\/span>;<\/span>\r\n    size_t substring_length =<\/span> my_str.<\/span>find<\/span>(<\/span>target_string)<\/span>;<\/span>\r\n    if<\/span> (<\/span>substring_length ==<\/span> 0<\/span>)<\/span>\r\n        std::<\/span>cout <<<\/span> \"No\\n\"<\/span>;<\/span>\r\n    else<\/span>\r\n        std::<\/span>cout <<<\/span> \"Length of matched substring = \"<\/span> <<<\/span> substring_length <<<\/span> std::<\/span>endl;<\/span>\r\n\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b\uff1a<\/p>\n
Is JournalDev a substring of Hello from JournalDev ?\r\nLength of matched substring = 11\r\n<\/code><\/pre>\n
\u898b\u3066\u306e\u901a\u308a\u3001\u30b5\u30d6\u30b9\u30c8\u30ea\u30f3\u30b0\u306f\u78ba\u304b\u306b\u79c1\u305f\u3061\u306e\u5143\u306e\u6587\u5b57\u5217\u306e\u4e2d\u306b\u3042\u308a\u307e\u3059\uff01<\/p>\n
\u4eca\u304b\u3089\u6587\u5b57\u5217\u306e\u7279\u5b9a\u306e\u4f4d\u7f6e\u304b\u3089\u540c\u3058\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
#<\/span>include<\/span> <iostream><\/span><\/span>\r\n#<\/span>include<\/span> <string><\/span><\/span>\r\n\r\nint<\/span> main<\/span>(<\/span>)<\/span> {<\/span>\r\n    \/\/ Create our string<\/span>\r\n    std::<\/span>string my_str<\/span>(<\/span>\"Hello from JournalDev\"<\/span>)<\/span>;<\/span>\r\n    \/\/ Target string to search for<\/span>\r\n    std::<\/span>string target_string<\/span>(<\/span>\"JournalDev\"<\/span>)<\/span>;<\/span>\r\n\r\n    std::<\/span>cout <<<\/span> \"Is \"<\/span> <<<\/span> target_string <<<\/span> \" a substring of \"<\/span> <<<\/span> my_str <<<\/span> \" ?\\n\"<\/span>;<\/span>\r\n    size_t substring_length =<\/span> my_str.<\/span>find<\/span>(<\/span>target_string,<\/span> 12<\/span>)<\/span>;<\/span> \/\/ Start from index 12 (from my_str[12])<\/span>\r\n    if<\/span> (<\/span>substring_length ==<\/span> 0<\/span>)<\/span>\r\n        std::<\/span>cout <<<\/span> \"No\\n\"<\/span>;<\/span>\r\n    else<\/span>\r\n        std::<\/span>cout <<<\/span> \"Length of matched substring = \"<\/span> <<<\/span> substring_length <<<\/span> std::<\/span>endl;<\/span>\r\n\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b\u3059\u308b<\/p>\n
Is JournalDev a substring of Hello from JournalDev ?\r\nLength of matched substring = 18446744073709551615\r\n<\/code><\/pre>\n
\u306a\u305c\u3053\u3093\u306a\u5947\u5999\u306a\u51fa\u529b\u304c\u5f97\u3089\u308c\u308b\u306e\u304b\uff1f\u5b9f\u306f\u3001\u5143\u306e\u6587\u5b57\u5217\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b912\u304b\u3089\u59cb\u3081\u3066\u3001\u305d\u306e\u4f4d\u7f6e\u304b\u3089\u306e\u90e8\u5206\u6587\u5b57\u5217\u306e\u9577\u3055\u304c\u5143\u306e\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u8d85\u3048\u3066\u3057\u307e\u3046\u304b\u3089\u3067\u3059\uff01<\/p>\n
\u3057\u305f\u304c\u3063\u3066\u3001\u79c1\u305f\u3061\u306f\u6587\u5b57\u5217\u306e\u672b\u5c3e\u306b\u5230\u9054\u3057\u305f\u5f8c\u3001\u30b4\u30df\u306e\u5834\u6240\u306b\u79fb\u52d5\u3057\u307e\u3059\u3002find()\u306f\u6587\u5b57\u5217\u306e\u7d42\u308f\u308a\u3092\u8d8a\u3048\u308b\u306e\u3067\u3001\u305d\u308c\u3092\u5fc3\u306b\u7559\u3081\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u3057\u305f\u304c\u3063\u3066\u3001\u6587\u5b57\u5217\u306e\u7d42\u308f\u308a\u306b\u5230\u9054\u3057\u305f\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u306e\u5371\u967a\u306a\u72b6\u614b\u3092\u4fee\u6b63\u3057\u307e\u3059\u3002<\/p>\n
C++\u306b\u306fstd::string::npos\u3068\u3044\u3046\u7279\u5225\u306a\u5909\u6570\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u306f\u73fe\u5728\u306e\u6587\u5b57\u5217\u3078\u306e\u30cf\u30f3\u30c9\u30eb\u3092\u8fd4\u3057\u3001\u6587\u5b57\u5217\u306e\u7d42\u7aef\u306b\u5230\u9054\u3057\u305f\u304b\u3069\u3046\u304b\u3092\u691c\u51fa\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
if<\/span> (<\/span>my_str.<\/span>find<\/span>(<\/span>target_str)<\/span> !=<\/span> std::<\/span>string::<\/span>npos)<\/span> {<\/span>\r\n    \/\/ This matches! We're still within the original string<\/span>\r\n}<\/span>\r\nelse<\/span> {<\/span>\r\n    \/\/ Oops! Out of bounds. Print error message!<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u5909\u66f4\u306b\u3088\u308a\u3001\u79c1\u305f\u3061\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002 (Kono henk\u014d ni yori, watashitachi no k\u014ddo wa tsugi no y\u014d ni narimasu.)<\/p>\n
#<\/span>include<\/span> <iostream><\/span><\/span>\r\n#<\/span>include<\/span> <string><\/span><\/span>\r\n\r\nint<\/span> main<\/span>(<\/span>)<\/span> {<\/span>\r\n    \/\/ Create our string<\/span>\r\n    std::<\/span>string my_str<\/span>(<\/span>\"Hello from JournalDev\"<\/span>)<\/span>;<\/span>\r\n    \/\/ Target string to search for<\/span>\r\n    std::<\/span>string target_string<\/span>(<\/span>\"JournalDev\"<\/span>)<\/span>;<\/span>\r\n\r\n    std::<\/span>cout <<<\/span> \"Is \"<\/span> <<<\/span> target_string <<<\/span> \" a substring of \"<\/span> <<<\/span> my_str <<<\/span> \" ?\\n\"<\/span>;<\/span>\r\n    size_t substring_length;<\/span>\r\n    if<\/span> (<\/span>(<\/span>substring_length =<\/span> my_str.<\/span>find<\/span>(<\/span>target_string,<\/span> 12<\/span>)<\/span>)<\/span> !=<\/span> std::<\/span>string::<\/span>npos)<\/span> {<\/span>\r\n        std::<\/span>cout <<<\/span> \"Length of matched substring = \"<\/span> <<<\/span> substring_length <<<\/span> std::<\/span>endl;<\/span>\r\n    }<\/span>\r\n    else<\/span> {<\/span>\r\n        std::<\/span>cout <<<\/span> \"No\\n\"<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b<\/p>\n
Is JournalDev a substring of Hello from JournalDev ?\r\nNo\r\n<\/code><\/pre>\n
\u4eca\u3001\u79c1\u305f\u3061\u306f\u671f\u5f85\u901a\u308a\u306e\u51fa\u529b\u3092\u5f97\u307e\u3059\u3001\u306a\u305c\u306a\u3089\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b912\u304b\u3089\u59cb\u3081\u308b\u304b\u3089\u3067\u3059\uff01<\/p>\n
\u3053\u306e\u30c1\u30a7\u30c3\u30af\u3092\u4f7f\u3063\u3066\u3001find()\u306e\u4ed6\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3055\u308c\u305f\u5f62\u5f0f\u3092\u30ab\u30a6\u30f3\u30c8\u3067\u8868\u793a\u3057\u307e\u3057\u3087\u3046\u3002C++\u306e\u6587\u5b57\u5217\u306b\u306f\u76f4\u63a5\u3053\u306e\u5f62\u5f0f\u3092\u4f7f\u7528\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u5fd8\u308c\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n
#<\/span>include<\/span> <iostream><\/span><\/span>\r\n#<\/span>include<\/span> <string><\/span><\/span>\r\n\r\nint<\/span> main<\/span>(<\/span>)<\/span> {<\/span>\r\n    \/\/ Create our string<\/span>\r\n    std::<\/span>string my_str<\/span>(<\/span>\"Hello from JournalDev\"<\/span>)<\/span>;<\/span>\r\n    \/\/ Target string to search for<\/span>\r\n    std::<\/span>string target_string<\/span>(<\/span>\"Journ_kkfffsfsfskkk\"<\/span>)<\/span>;<\/span>\r\n\r\n    std::<\/span>cout <<<\/span> \"Is \"<\/span> <<<\/span> target_string <<<\/span> \" a substring of \"<\/span> <<<\/span> my_str <<<\/span> \" ?\\n\"<\/span>;<\/span>\r\n    size_t substring_length;<\/span>\r\n    \/\/ Use a count to match only 5 characters<\/span>\r\n    \/\/ Note that we can use this form only for const char* strings<\/span>\r\n    if<\/span> (<\/span>(<\/span>substring_length =<\/span> my_str.<\/span>find<\/span>(<\/span>\"Journ_kkfffsfsfskkk\"<\/span>,<\/span> 0<\/span>,<\/span> 5<\/span>)<\/span>)<\/span> !=<\/span> std::<\/span>string::<\/span>npos)<\/span> {<\/span>\r\n        std::<\/span>cout <<<\/span> \"Length of matched substring = \"<\/span> <<<\/span> substring_length <<<\/span> std::<\/span>endl;<\/span>\r\n    }<\/span>\r\n    else<\/span> {<\/span>\r\n        std::<\/span>cout <<<\/span> \"No\\n\"<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b<\/p>\n
Is Journ_kkfffsfsfskkk a substring of Hello from JournalDev ?\r\nLength of matched substring = 11\r\n<\/code><\/pre>\n
\u79c1\u305f\u3061\u306e\u5bfe\u8c61\u6587\u5b57\u5217\u304c\u5909\u66f4\u3055\u308c\u305f\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u3053\u3067\u306f\u3001\u6700\u521d\u306e5\u6587\u5b57\u3060\u3051\u304c\u4e00\u81f4\u3057\u307e\u3059\u304c\u3001\u305d\u308c\u306f5\u3064\u306e\u5236\u9650\u30ab\u30a6\u30f3\u30bf\u30fc\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u305f\u3081\u3001find()\u306b\u306f\u5341\u5206\u3067\u3059\uff01<\/p>\n
\u305d\u308c\u306b\u3088\u3063\u3066\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u306e\u30b5\u30d6\u30b9\u30c8\u30ea\u30f3\u30b0\u306e\u6b8b\u308a\u90e8\u5206\u306f\u5358\u7d14\u306b\u7121\u8996\u3055\u308c\u3001\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u6587\u5b57\u5217\u306e\u7d42\u308f\u308a\u307e\u3067\u4e00\u81f4\u304c\u7d9a\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n
\u305d\u308c\u304c\u7406\u7531\u306a\u306e\u3067\u3001\u79c1\u305f\u3061\u306f\u307e\u306011\u3092\u5f97\u3066\u3044\u308b\u306e\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001\u305d\u3053\u306b\u90e8\u5206\u6587\u5b57\u5217\u306e\u4e00\u81f4\u304c\u898b\u3064\u304b\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n
\n
\u7d50\u8ad6<\/h2>\n
\u3053\u308c\u3089\u306e\u4f8b\u3092\u3059\u3079\u3066\u4f7f\u7528\u3057\u3066\u3001C++\u306estring.find()\u30e1\u30bd\u30c3\u30c9\u3092\u7c21\u5358\u306b\u4f7f\u3044\u59cb\u3081\u308b\u65b9\u6cd5\u304c\u7406\u89e3\u3067\u304d\u305f\u3068\u601d\u3044\u307e\u3059\u3002\u3082\u3057\u7591\u554f\u70b9\u304c\u3042\u308c\u3070\u3001\u4ee5\u4e0b\u306e\u30b3\u30e1\u30f3\u30c8\u6b04\u3067\u8cea\u554f\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
\u307e\u305f\u3001\u79c1\u305f\u3061\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u3042\u308bC++\u306b\u95a2\u9023\u3059\u308b\u4ed6\u306e\u8a18\u4e8b\u3082\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\uff01<\/p>\n
\n
\u53c2\u8003\u6587\u732e<\/h2>\n
    \n
  • cppreference.com page on using string find() in C++<\/li>\n
  • StackOverflow question on string find()<\/li>\n<\/ul>\n
    \n","protected":false},"excerpt":{"rendered":"
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