std::basic_string::find

 

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std::basic_string

メンバ関数 Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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basic_string::find

basic_string::rfind

basic_string::find_first_of

basic_string::find_first_not_of

basic_string::find_last_of

basic_string::find_last_not_of

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basic_string::npos

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size_type find(const basic_string& str, size_type pos =0)const;	(1)
size_type find(const CharT* s, size_type pos, size_type count )const;	(2)
size_type find(const CharT* s, size_type pos =0)const;	(3)
size_type find( CharT ch, size_type pos =0)const;	(4)

指定された文字シーケンスと一致する最初の部分文字列を検索します。検索はposから始まります。つまり、発見される部分文字列はposより前から始まることはありません。

1)

strに等しい最初の部分文字列を検索し.

Original:

Finds the first substring equal to str.

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2)

countが指す文字列の最初のs文字に等しい最初の部分文字列を検索します。 sはヌル文字を含めることができます.

Original:

Finds the first substring equal to the first count characters of the character string pointed to by s. s can include null characters.

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3)

sが指す文字列と等しい最初の部分文字列を検索します。文字列の長さは、最初のnull文字によって決定されます.

Original:

Finds the first substring equal to the character string pointed to by s. The length of the string is determined by the first null character.

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4)

最初の文字chを見つけ.

Original:

Finds the first character ch.

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パラメータ

str	-	検索する文字列 Original: string to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	を検索するための文字列の長さ Original: length of substring to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
s	-	※更に用する文字列へのポインタ Original: pointer to a character string to seach for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ch	-	文字を検索します Original: character to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

返り値

見つかった部分文字列の最初の文字の位置か、見つからなかった場合はnposを返します。

例

このコードを実行します

#include <string>#include <iostream>   void print(std::string::size_type n, std::stringconst&s){if(n ==std::string::npos){std::cout<<"not found\n";}else{std::cout<<"found: "<< s.substr(n)<<'\n';}}   int main(){ std::string::size_type n;std::stringconst s ="This is a string";   // search from beginning of string n = s.find("is"); print(n, s);   // search from position 5 n = s.find("is", 5); print(n, s);   // find a single character n = s.find('a'); print(n, s);   // find a single character n = s.find('q'); print(n, s);}

出力:

found: is is a string found: is a string found: a string not found

参考

rfind	部分文字列が最後に現れる場所を見つける Original: find the last occurrence of a substring The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数)
find_first_of	文字が最初に現れる位置を見つける Original: find first occurrence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数)
find_first_not_of	文字の最初の不在を見つける Original: find first absence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数)
find_last_of	文字が最後に現れる場所を見つける Original: find last occurrence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数)
find_last_not_of	最後の文字が存在しないことを見つける Original: find last absence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数)