{"id":34846,"date":"2025-05-01T06:02:59","date_gmt":"2025-04-30T22:02:59","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/34846.html"},"modified":"2025-05-01T06:02:59","modified_gmt":"2025-04-30T22:02:59","slug":"%e3%80%90%e7%ae%97%e6%b3%95%e7%ac%94%e8%ae%b0%e3%80%91%e5%a6%82%e4%bd%95%e4%bc%98%e9%9b%85%e7%9a%84%e8%bf%9b%e8%a1%8c%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/34846.html","title":{"rendered":"\u3010\u7b97\u6cd5\u7b14\u8bb0\u3011\u5982\u4f55\u4f18\u96c5\u7684\u8fdb\u884c\u5b57\u7b26\u4e32\u64cd\u4f5c"},"content":{"rendered":"

\u6700\u8fd1\u7684CCCC\u5929\u68af\u8d5b\u53c8\u51fa\u4e86\u975e\u5e38\u6076\u5fc3\u7684\u5b57\u7b26\u4e32\u9898~ \u5728\u7f16\u7a0b\u7ade\u8d5b（\u7279\u522b\u662fCCCC\u5929\u68af\u8d5b）\u4e2d，\u5b57\u7b26\u4e32\u64cd\u4f5c\u7c7b\u9898\u76ee\u5f80\u5f80\u770b\u4f3c\u7b80\u5355\u5374\u6697\u85cf\u9677\u9631\u3002\u672c\u6587\u5c06\u4ee5Python\u3001Java\u3001C++ \u4e09\u5251\u5ba2\u4e3a\u4f8b，\u603b\u7ed3\u9ad8\u9891\u5b57\u7b26\u4e32\u64cd\u4f5c\u7684\u4f18\u96c5\u5b9e\u73b0\u65b9\u6848，\u52a9\u4f60\u5feb\u901f\u653b\u514b\u5b57\u7b26\u4e32\u7c7b\u96be\u9898\u3002<\/p>\n

\n

\u4e00\u3001\u5b50\u4e32\u66ff\u6362：\u7cbe\u51c6\u72d9\u51fb\u7b2c\u4e00\u4e2a\u76ee\u6807<\/p>\n

\u9700\u6c42\u63cf\u8ff0 \u5c06\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u4e2a\u51fa\u73b0\u7684\u5b50\u4e32A\u66ff\u6362\u4e3a\u5b50\u4e32B，\u82e5A\u4e0d\u5b58\u5728\u5219\u4fdd\u6301\u539f\u5b57\u7b26\u4e32\u3002<\/p>\n

Python<\/p>\n

def<\/span> replace_first_substring<\/span>(<\/span>s,<\/span> A,<\/span> B)<\/span>:<\/span>
\n return<\/span> s.<\/span>replace(<\/span>A,<\/span> B,<\/span> 1<\/span>)<\/span> # \u7b2c\u4e09\u4e2a\u53c2\u6570\u63a7\u5236\u66ff\u6362\u6b21\u6570<\/span><\/p>\n

# \u793a\u4f8b：\u5c06\u9996\u4e2a"apple"\u6362\u4e3a"orange"<\/span>
\nprint<\/span>(<\/span>replace_first_substring(<\/span>"apple banana apple"<\/span>,<\/span> "apple"<\/span>,<\/span> "orange"<\/span>)<\/span>)<\/span> # orange banana apple<\/span><\/p>\n

Java \u65b9\u6848\u4e00：\u6b63\u5219\u5b89\u5168\u7248（\u907f\u514d\u7279\u6b8a\u5b57\u7b26\u5e72\u6270）<\/p>\n

import<\/span> java.<\/span>util.<\/span>regex.<\/span><\/span>*<\/span>;<\/span><\/p>\n

public<\/span> class<\/span> StringUtils<\/span> {<\/span>
\n public<\/span> static<\/span> String<\/span> replaceFirstSubstring<\/span>(<\/span>String<\/span> str,<\/span> String<\/span> A<\/span>,<\/span> String<\/span> B<\/span>)<\/span> {<\/span>
\n return<\/span> str.<\/span>replaceFirst<\/span>(<\/span>Pattern<\/span>.<\/span>quote<\/span>(<\/span>A<\/span>)<\/span>,<\/span> Matcher<\/span>.<\/span>quoteReplacement<\/span>(<\/span>B<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\/\/ \u793a\u4f8b：\u66ff\u6362\u9996\u4e2a\u5305\u542b\u6b63\u5219\u7b26\u53f7\u7684\u5b57\u7b26\u4e32<\/span>
\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>replaceFirstSubstring<\/span>(<\/span>"a+b*c"<\/span>,<\/span> "+b*"<\/span>,<\/span> "-"<\/span>)<\/span>)<\/span>;<\/span> \/\/ a-c<\/span><\/p>\n

\u65b9\u6848\u4e8c：\u9ad8\u6548\u76f4\u64cd\u4f5c\u7248<\/p>\n

public<\/span> static<\/span> String<\/span> replaceFirstSubstring<\/span>(<\/span>String<\/span> str,<\/span> String<\/span> A<\/span>,<\/span> String<\/span> B<\/span>)<\/span> {<\/span>
\n int<\/span> index =<\/span> str.<\/span>indexOf<\/span>(<\/span>A<\/span>)<\/span>;<\/span>
\n return<\/span> index !=<\/span> –<\/span>1<\/span> ?<\/span> str.<\/span>substring<\/span>(<\/span>0<\/span>,<\/span> index)<\/span> +<\/span> B<\/span> +<\/span> str.<\/span>substring<\/span>(<\/span>index +<\/span> A<\/span>.<\/span>length<\/span>(<\/span>)<\/span>)<\/span> :<\/span> str;<\/span>
\n}<\/span><\/p>\n

C++<\/p>\n

#<\/span>include<\/span> <string><\/span><\/span>
\nusing<\/span> namespace<\/span> std;<\/span><\/p>\n

string replace_first_substring<\/span>(<\/span>string str,<\/span> const<\/span> string&<\/span> A,<\/span> const<\/span> string&<\/span> B)<\/span> {<\/span>
\n size_t pos =<\/span> str.<\/span>find<\/span>(<\/span>A)<\/span>;<\/span>
\n if<\/span> (<\/span>pos !=<\/span> string::<\/span>npos)<\/span> {<\/span>
\n str.<\/span>replace<\/span>(<\/span>pos,<\/span> A.<\/span>length<\/span>(<\/span>)<\/span>,<\/span> B)<\/span>;<\/span>
\n }<\/span>
\n return<\/span> str;<\/span>
\n}<\/span><\/p>\n

\/\/ \u793a\u4f8b：\u66ff\u6362\u9996\u4e2a"cpp"<\/span>
\ncout <<<\/span> replace_first_substring<\/span>(<\/span>"cpp python cpp"<\/span>,<\/span> "cpp"<\/span>,<\/span> "C++"<\/span>)<\/span>;<\/span> \/\/ C++ python cpp<\/span><\/p>\n

\n

\u4e8c\u3001\u5220\u9664\u64cd\u4f5c：\u5b9a\u70b9\u6e05\u9664\u4e0e\u7cbe\u786e\u7206\u7834<\/p>\n

\u573a\u666f\u4e00：\u5220\u9664\u9996\u4e2a\u6307\u5b9a\u5b50\u4e32 Python<\/p>\n

def<\/span> delete_first_substring<\/span>(<\/span>s,<\/span> A)<\/span>:<\/span>
\n return<\/span> s.<\/span>replace(<\/span>A,<\/span> ""<\/span>,<\/span> 1<\/span>)<\/span> # \u7b2c\u4e09\u4e2a\u53c2\u6570\u63a7\u5236\u5220\u9664\u6b21\u6570<\/span><\/p>\n

print<\/span>(<\/span>delete_first_substring(<\/span>"test_test"<\/span>,<\/span> "test"<\/span>)<\/span>)<\/span> # _test<\/span><\/p>\n

Java<\/p>\n

public<\/span> static<\/span> String<\/span> deleteFirstSubstring<\/span>(<\/span>String<\/span> str,<\/span> String<\/span> A<\/span>)<\/span> {<\/span>
\n int<\/span> index =<\/span> str.<\/span>indexOf<\/span>(<\/span>A<\/span>)<\/span>;<\/span>
\n return<\/span> index !=<\/span> –<\/span>1<\/span> ?<\/span> str.<\/span>substring<\/span>(<\/span>0<\/span>,<\/span> index)<\/span> +<\/span> str.<\/span>substring<\/span>(<\/span>index +<\/span> A<\/span>.<\/span>length<\/span>(<\/span>)<\/span>)<\/span> :<\/span> str;<\/span>
\n}<\/span><\/p>\n

\/\/ \u793a\u4f8b：\u5220\u9664\u9996\u4e2a"bug"<\/span>
\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>deleteFirstSubstring<\/span>(<\/span>"bug1 bug2"<\/span>,<\/span> "bug"<\/span>)<\/span>)<\/span>;<\/span> \/\/ 1 bug2<\/span><\/p>\n

C++<\/p>\n

string delete_first_substring<\/span>(<\/span>string str,<\/span> const<\/span> string&<\/span> A)<\/span> {<\/span>
\n size_t pos =<\/span> str.<\/span>find<\/span>(<\/span>A)<\/span>;<\/span>
\n if<\/span> (<\/span>pos !=<\/span> string::<\/span>npos)<\/span> {<\/span>
\n str.<\/span>erase<\/span>(<\/span>pos,<\/span> A.<\/span>length<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n return<\/span> str;<\/span>
\n}<\/span><\/p>\n

\u573a\u666f\u4e8c：\u5220\u9664\u6307\u5b9a\u7d22\u5f15\u5b57\u7b26 Python<\/p>\n

s =<\/span> "012345"<\/span>
\ns =<\/span> s[<\/span>:<\/span>3<\/span>]<\/span> +<\/span> s[<\/span>4<\/span>:<\/span>]<\/span> # \u5220\u9664\u7d22\u5f153\u7684\u5b57\u7b26<\/span>
\nprint<\/span>(<\/span>s)<\/span> # 01245<\/span><\/p>\n

Java<\/p>\n

String<\/span> str =<\/span> "ABCDEF"<\/span>;<\/span>
\nString<\/span> newStr =<\/span> str.<\/span>substring<\/span>(<\/span>0<\/span>,<\/span> 2<\/span>)<\/span> +<\/span> str.<\/span>substring<\/span>(<\/span>3<\/span>)<\/span>;<\/span> \/\/ \u5220\u9664\u7d22\u5f152<\/span>
\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>newStr)<\/span>;<\/span> \/\/ ABDEF<\/span><\/p>\n

C++<\/p>\n

string str =<\/span> "Hello!"<\/span>;<\/span>
\nstr.<\/span>erase<\/span>(<\/span>5<\/span>,<\/span> 1<\/span>)<\/span>;<\/span> \/\/ \u5220\u9664\u7d22\u5f155\u7684\u5b57\u7b26（!）<\/span>
\ncout <<<\/span> str;<\/span> \/\/ Hello<\/span><\/p>\n

\n

\u4e09\u3001\u5207\u7247\u64cd\u4f5c<\/p>\n

\u622a\u53d6\u533a\u95f4 [start, end) \u7684\u5b50\u4e32 Python<\/p>\n

s =<\/span> "abcdef"<\/span>
\nprint<\/span>(<\/span>s[<\/span>2<\/span>:<\/span>5<\/span>]<\/span>)<\/span> # cde （\u7d22\u5f152\u52304）<\/span><\/p>\n

Java<\/p>\n

String<\/span> str =<\/span> "ABCDEF"<\/span>;<\/span>
\nString<\/span> sub =<\/span> str.<\/span>substring<\/span>(<\/span>1<\/span>,<\/span> 4<\/span>)<\/span>;<\/span> \/\/ \u7d22\u5f151\u52303<\/span>
\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>sub)<\/span>;<\/span> \/\/ BCD<\/span><\/p>\n

C++<\/p>\n

string str =<\/span> "123456"<\/span>;<\/span>
\nstring sub =<\/span> str.<\/span>substr<\/span>(<\/span>2<\/span>,<\/span> 3<\/span>)<\/span>;<\/span> \/\/ \u4ece\u7d22\u5f152\u5f00\u59cb\u53d63\u4e2a\u5b57\u7b26<\/span>
\ncout <<<\/span> sub;<\/span> \/\/ 345<\/span><\/p>\n

\n

\u56db\u3001\u5b57\u7b26\u4e32\u7ffb\u8f6c：\u955c\u50cf\u4e16\u754c\u7684\u9b54\u6cd5<\/p>\n

Python<\/p>\n

s =<\/span> "hello"<\/span>
\nreversed_str =<\/span> s[<\/span>:<\/span>:<\/span>–<\/span>1<\/span>]<\/span> # \u5207\u7247\u6b65\u957f-1\u5b9e\u73b0\u53cd\u8f6c<\/span>
\nprint<\/span>(<\/span>reversed_str)<\/span> # olleh<\/span><\/p>\n

Java<\/p>\n

String<\/span> str =<\/span> "reverse"<\/span>;<\/span>
\nString<\/span> reversed =<\/span> new<\/span> StringBuilder<\/span>(<\/span>str)<\/span>.<\/span>reverse<\/span>(<\/span>)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span>;<\/span>
\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>reversed)<\/span>;<\/span> \/\/ esrever<\/span><\/p>\n

C++<\/p>\n

string str =<\/span> "CPP"<\/span>;<\/span>
\nreverse<\/span>(<\/span>str.<\/span>begin<\/span>(<\/span>)<\/span>,<\/span> str.<\/span>end<\/span>(<\/span>)<\/span>)<\/span>;<\/span> # \u539f\u5730\u53cd\u8f6c
\ncout <<<\/span> str;<\/span> \/\/ PPC<\/span><\/p>\n

\n

\u5173\u952e\u70b9\u603b\u7ed3<\/p>\n\n\u64cd\u4f5c\u7c7b\u578bPython\u4f18\u52bfJava\u6280\u5de7C++\u7279\u6027<\/tr>\n\n\n\n\n\n
\u66ff\u6362<\/td>\nreplace\u6b21\u6570\u63a7\u5236<\/td>\n\u6b63\u5219\u8f6c\u4e49\u9632\u9677\u9631<\/td>\nfind+replace\u94fe\u5f0f\u64cd\u4f5c<\/td>\n<\/tr>\n
\u5220\u9664<\/td>\n\u7a7a\u66ff\u6362\u590d\u7528\u903b\u8f91<\/td>\nindexOf\u8fb9\u754c\u68c0\u67e5<\/td>\nerase\u7cbe\u51c6\u6e05\u9664<\/td>\n<\/tr>\n
\u5207\u7247<\/td>\n[start:end]\u6781\u7b80\u8bed\u6cd5<\/td>\n\u53cc\u53c2\u6570substring<\/td>\nsubstr\u8d77\u59cb\u4f4d\u7f6e+\u957f\u5ea6<\/td>\n<\/tr>\n
\u7ffb\u8f6c<\/td>\n\u8d1f\u6b65\u957f\u5207\u7247<\/td>\nStringBuilder\u5de5\u5177\u7c7b<\/td>\nreverse\u7b97\u6cd5\u76f4\u63a5\u4fee\u6539<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

\u907f\u5751\u6307\u5357<\/p>\n

  • \n

    Java\u7684substring\u7d22\u5f15\u9677\u9631 str.substring(a, b) \u7684\u7ed3\u675f\u7d22\u5f15\u662f\u72ec\u5360\u7684（\u5373\u5305\u542ba\u4e0d\u5305\u542bb），\u4e0ePython\u5207\u7247\u884c\u4e3a\u4e00\u81f4<\/p>\n<\/li>\n

  • \n

    C++\u7684substr\u53c2\u6570\u7279\u6b8a\u6027 \u7b2c\u4e8c\u4e2a\u53c2\u6570\u8868\u793a\u622a\u53d6\u957f\u5ea6\u800c\u975e\u7ed3\u675f\u4f4d\u7f6e，\u9700\u7279\u522b\u6ce8\u610f str.substr(2, 3) \u8868\u793a\u4ece\u7d22\u5f152\u5f00\u59cb\u53d63\u4e2a\u5b57\u7b26<\/p>\n<\/li>\n

  • \n

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