检查字符串是否包含任何特殊字符的程序

给定一个字符串，任务是检查该字符串是否包含任何特殊字符（定义的特殊字符集）。如果发现任何特殊字符，请不要接受该字符串。
例子 ：

Input : Geeks$For$Geeks
Output : String is not accepted.

Input : Geeks For Geeks
Output : String is accepted

方法：将所有不需要的特殊字符创建一个正则表达式（regex）对象，然后在搜索方法中传递一个字符串。如果字符串的任何一个字符与正则表达式对象匹配，则搜索方法返回匹配对象，否则返回无。
下面是实现：

C++

// C++ program to check if a string
// contains any special character
 
// import required packages
#include 
#include 
using namespace std;
 
// Function checks if the string
// contains any special character
void run(string str)
{
     
    // Make own character set
    regex regx("[@_!#$%^&*()<>?/|}{~:]");
 
    // Pass the string in regex_search
    // method
    if(regex_search(str, regx) == 0)
        cout << "String is accepted";
    else
        cout << "String is not accepted.";
}
 
// Driver Code
int main()
{
     
    // Enter the string
    string str = "Geeks$For$Geeks";
     
    // Calling run function
    run(str);
 
    return 0;
}
 
// This code is contributed by Yash_R

Python3

# Python3 program to check if a string
# contains any special character
 
# import required package
import re
 
# Function checks if the string
# contains any special character
def run(string):
 
    # Make own character set and pass
    # this as argument in compile method
    regex = re.compile('[@_!#$%^&*()<>?/\|}{~:]')
     
    # Pass the string in search
    # method of regex object.   
    if(regex.search(string) == None):
        print("String is accepted")
         
    else:
        print("String is not accepted.")
     
 
# Driver Code
if __name__ == '__main__' :
     
    # Enter the string
    string = "Geeks$For$Geeks"
     
    # calling run function
    run(string)

PHP

?/\|}{~:]',
                                         $string);
    if($regex)
        print("String is accepted");
         
    else
        print("String is not accepted.");
}
 
// Driver Code
 
// Enter the string
$string = 'Geeks$For$Geeks';
 
// calling run function
run($string);
 
// This code is contributed by Aman ojha
?>

输出 ：

String is not accepted.