从字符串中拆分数字、字母和特殊符号-yiteyi-C++库

给定string str，将字符串分为三部分：一部分包含数字部分，一部分包含字母部分，另一部分包含特殊字符。

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例如：

Input : geeks01for02geeks03!!!Output :geeksforgeeks        010203        !!!Here str = "Geeks01for02Geeks03!!!", we scan every character and append in res1, res2 and res3 string accordingly.Input : **Docoding123456789everyday##Output :Docodingeveryday        123456789        **##

建议：请在“上解决” 实践 “首先，在讨论解决方案之前。

步骤：

计算字符串的长度。
逐个扫描字符串中的每个字符（ch）
- 如果（ch是一个数字），则将其追加到res1字符串中。
- else if（ch是字母表）附加在字符串res2中。
- else在字符串res3中追加。
打印所有字符串，我们将有一个字符串包含数字部分，其他非数字部分，最后一个包含特殊字符。

C++

                         // CPP program to split an alphanumeric                       
                         // string using STL                       
                         #include<bits/stdc++.h>                       
                         using                                     namespace                                     std;                       
           
                         void                                     splitString(string str)                       
                         {                       
                                                 string alpha, num, special;                       
                                                 for                                     (                                     int                                     i=0; i<str.length(); i++)                       
                                                 {                       
                                                 if                                     (                                     isdigit                                     (str[i]))                       
                                                 num.push_back(str[i]);                       
                                                 else                                     if                                     ((str[i] >=                                     'A'                                     && str[i] <=                                     'Z'                                     ) ||                       
                                                 (str[i] >=                                     'a'                                     && str[i] <=                                     'z'                                     ))                       
                                                 alpha.push_back(str[i]);                       
                                                 else                       
                                                 special.push_back(str[i]);                       
                                                 }                       
           
                                                 cout << alpha << endl;                       
                                                 cout << num << endl;                       
                                                 cout << special << endl;                       
                         }                       
           
                         // Driver code                       
                         int                                     main()                       
                         {                       
                                                 string str =                                     "geeks01$$for02geeks03!@!!"                                     ;                       
                                                 splitString(str);                       
                                                 return                                     0;                       
                         }                       

JAVA

                         // java program to split an alphanumeric                       
                         // string using stringbuffer                       
           
                         class                                     Test                       
                         {                       
                                                 static                                     void                                     splitString(String str)                       
                                                 {                       
                                                 StringBuffer alpha =                                     new                                     StringBuffer(),                       
                                                 num =                                     new                                     StringBuffer(), special =                                     new                                     StringBuffer();                       
                                   
                                                 for                                     (                                     int                                     i=                                     0                                     ; i<str.length(); i++)                       
                                                 {                       
                                                 if                                     (Character.isDigit(str.charAt(i)))                       
                                                 num.append(str.charAt(i));                       
                                                 else                                     if                                     (Character.isAlphabetic(str.charAt(i)))                       
                                                 alpha.append(str.charAt(i));                       
                                                 else                       
                                                 special.append(str.charAt(i));                       
                                                 }                       
                                   
                                                 System.out.println(alpha);                       
                                                 System.out.println(num);                       
                                                 System.out.println(special);                       
                                                 }                       
                                   
                                                 // Driver method                       
                                                 public                                     static                                     void                                     main(String args[])                       
                                                 {                       
                                                 String str =                                     "geeks01$$for02geeks03!@!!"                                     ;                       
                                                 splitString(str);                       
                                                 }                       
                         }                       

Python3

                         # Python 3 program to split an alphanumeric                       
                         # string using STL                       
                         def                                     splitString(                                     str                                     ):                       
           
                                                 alpha                                     =                                     ""                       
                                                 num                                     =                                     ""                       
                                                 special                                     =                                     ""                       
                                                 for                                     i                                     in                                     range                                     (                                     len                                     (                                     str                                     )):                       
                                                 if                                     (                                     str                                     [i].isdigit()):                       
                                                 num                                     =                                     num                                     +                                     str                                     [i]                       
                                                 elif                                     ((                                     str                                     [i] >                                     =                                     'A'                                     and                                     str                                     [i] <                                     =                                     'Z'                                     )                                     or                       
                                                 (                                     str                                     [i] >                                     =                                     'a'                                     and                                     str                                     [i] <                                     =                                     'z'                                     )):                       
                                                 alpha                                     +                                     =                                     str                                     [i]                       
                                                 else                                     :                       
                                                 special                                     +                                     =                                     str                                     [i]                       
           
                                                 print                                     (alpha)                       
                                                 print                                     (num )                       
                                                 print                                     (special)                       
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     "__main__"                                     :                       
                                   
                                                 str                                     =                                     "geeks01$$for02geeks03!@!!"                       
                                                 splitString(                                     str                                     )                       
           
                         # This code is contributed by ita_c                       

C#

                         // C# program to split an alphanumeric                       
                         // string using stringbuffer                       
                         using                                     System;                       
                         using                                     System.Text;                       
           
                         class                                     GFG  {                       
                                   
                                                 // Function ot split string                       
                                                 static                                     void                                     splitString(                                     string                                     str)                       
                                                 {                       
                                                 StringBuilder alpha =                       
                                                 new                                     StringBuilder();                       
                                                 StringBuilder num =                       
                                                 new                                     StringBuilder();                       
                                                 StringBuilder special =                       
                                                 new                                     StringBuilder();                       
                                   
                                                 for                                     (                                     int                                     i = 0; i < str.Length; i++)                       
                                                 {                       
                                                 if                                     (Char.IsDigit(str[i]))                       
                                                 num.Append(str[i]);                       
                                                 else                                     if                                     ((str[i] >=                                     'A'                                     &&                       
                                                 str[i] <=                                     'Z'                                     ) ||                       
                                                 (str[i] >=                                     'a'                                     &&                       
                                                 str[i] <=                                     'z'                                     ))                       
                                                 alpha.Append(str[i]);                       
                                                 else                       
                                                 special.Append(str[i]);                       
                                                 }                       
                                   
                                                 Console.WriteLine(alpha);                       
                                                 Console.WriteLine(num);                       
                                                 Console.WriteLine(special);                       
                                                 }                       
                                   
                                                 // Driver code                       
                                                 public                                     static                                     void                                     Main()                       
                                                 {                       
                                                 string                                     str =                                     "geeks01$$for02geeks03!@!!"                                     ;                       
                                                 splitString(str);                       
                                                 }                       
                         }                       
           
                         // This code is contributed by Sam007                       

Javascript

                         <script>                       
                         // Javascript program to split an alphanumeric                       
                         // string using stringbuffer                       
                                   
                                                 function                                     splitString(str)                       
                                                 {                       
                                                 let alpha =                                     ""                                     ;                       
                                                 let num =                                     ""                                     ;                       
                                                 let special =                                     ""                                     ;                       
                                                 for                                     (let i=0; i<str.length; i++)                       
                                                 {                       
                                                 if                                     (!isNaN(String(str[i]) * 1))                       
                                                 num+=str[i];                       
                                                 else                                     if                                     ((str[i] >=                                     'A'                                     && str[i] <=                                     'Z'                                     ) ||                       
                                                 (str[i] >=                                     'a'                                     && str[i] <=                                     'z'                                     ))                       
                                                 alpha+=str[i];                       
                                                 else                       
                                                 special+=str[i];                       
                                                 }                       
                                   
                                                 document.write(alpha+                                     "<br>"                                     );                       
                                                 document.write(num+                                     "<br>"                                     );                       
                                                 document.write(special+                                     "<br>"                                     );                       
                                                 }                       
                                   
                                                 // Driver method                       
                                                 let str =                                     "geeks01$$for02geeks03!@!!"                                     ;                       
                                                 splitString(str);                       
                                   
                                                 // This code is contributed by avanitrachhadiya2155                       
                         </script>                       

输出：

geeksforgeeks010203$$!@!!

上述解的时间复杂度为O（n），其中n是字符串的长度。

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