检查字符串包含大写，小写，特殊字符和数字值

给定长度为N的字符串str ，任务是检查给定的字符串是否包含大写字母，小写字母，特殊字符和数字值。如果字符串包含所有字符串，则打印“是” 。否则，打印“否” 。

例子：

Input: str = “#GeeksForGeeks123@” 
Output: Yes 
Explanation: 
The given string contains uppercase characters(‘G’, ‘F’), lowercase characters(‘e’, ‘k’, ‘s’, ‘o’, ‘r’), special characters( ‘#’, ‘@’), and numeric values(‘1’, ‘2’, ‘3’). Therefore, the output is Yes. 
 

Input: str = “GeeksForGeeks” 
Output: No 
Explanation: 
The given string contains only uppercase characters and lowercase characters. Therefore, the output is No.

天真的方法：最简单的方法是遍历字符串，并检查给定的字符串包含大写，小写，数字和特殊字符。步骤如下：

1. 通过字符遍历字符串的字符从开始到结束。
2. 检查每个字符的ASCII值是否满足以下条件：
   • 如果ASCII值在[65，90]的范围内，则它是一个大写字母。
   • 如果ASCII值在[97，122]的范围内，则它是小写字母。
   • 如果ASCII值在[48，57]范围内，则它是一个数字。
   • 如果ASCII值在[32，47] ， [58，64] ， [91，96]或[123，126]范围内，则它是一个特殊字符
3. 如果字符串包含以上所有内容，则打印是。否则，打印No。

时间复杂度： O(N)
辅助空间： O(1)

正则表达式方法：这个想法是针对正则表达式的概念来解决这个问题的。步骤如下：

• 创建一个正则表达式来检查给定的字符串包含大写，小写，特殊字符和数字值，如下所述：

regex = “^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)” + “(?=.*[-+_!@#$%^&*., ?]).+$” 
where, 
 

• ^ represents the starting of the string.
• (?=.*[a-z]) represent at least one lowercase character.
• (?=.*[A-Z]) represents at least one uppercase character.
• (?=.*\\d) represents at least one numeric value.
• (?=.*[-+_!@#$%^&*., ?]) represents at least one special character.
• . represents any character except line break.
• + represents one or more times.

• 使用Pattern.matcher()将给定的字符串与正则表达式匹配。
• 如果字符串以给定的正则表达式匹配打印是。否则，打印No。

下面是上述方法的实现：

C++

// C++ program to check if the string
// contains uppercase, lowercase
// special character & numeric value
#include 
#include 
using namespace std;
void isAllPresent(string str)
{
   
  // Regex to check if a string
  // contains uppercase, lowercase
  // special character & numeric value
  const regex pattern("^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[-+_!@#$%^&*.,?]).+$");
 
  // If the string is empty
  // then print No
  if (str.empty())
  {
    cout<<"No"<

---

Java

// Java program for the above approach
 
import java.util.regex.*;
 
class GFG {
 
    // Function that checks if a string
    // contains uppercase, lowercase
    // special character & numeric value
    public static void
    isAllPresent(String str)
    {
        // ReGex to check if a string
        // contains uppercase, lowercase
        // special character & numeric value
        String regex = "^(?=.*[a-z])(?=."
                       + "*[A-Z])(?=.*\\d)"
                       + "(?=.*[-+_!@#$%^&*., ?]).+$";
 
        // Compile the ReGex
        Pattern p = Pattern.compile(regex);
 
        // If the string is empty
        // then print No
        if (str == null) {
            System.out.println("No");
            return;
        }
 
        // Find match between given string
        // & regular expression
        Matcher m = p.matcher(str);
 
        // Print Yes if string
        // matches ReGex
        if (m.matches())
            System.out.println("Yes");
        else
            System.out.println("No");
    }
 
    // Driver Code
    public static void main(String args[])
    {
        // Given string
        String str = "#GeeksForGeeks123@";
 
        // Function Call
        isAllPresent(str);
    }
}

Python3

# Python3 program for the
# above approach
import re
 
# Function that checks if a string
# contains uppercase, lowercase
# special character & numeric value
def isAllPresent(str):
 
    # ReGex to check if a string
    # contains uppercase, lowercase
    # special character & numeric value
    regex = ("^(?=.*[a-z])(?=." +
             "*[A-Z])(?=.*\\d)" +
             "(?=.*[-+_!@#$%^&*., ?]).+$")
     
    # Compile the ReGex
    p = re.compile(regex)
 
    # If the string is empty
    # return false
    if (str == None):
        print("No")
        return
 
    # Print Yes if string
    # matches ReGex
    if(re.search(p, str)):
        print("Yes")
    else:
        print("No")
 
# Driver code
 
# Given string
str = "#GeeksForGeeks123@"
 
#Function Call
isAllPresent(str)
 
# This code is contributed by avanitrachhadiya2155

输出：

Yes

时间复杂度： O(N)
辅助空间： O(1)