Program to check if a string contains any special character
Given a string, the task is to check if that string contains any special character (defined special character set). If any special character found, don’t accept that string.
Examples :
Input : Geeks$For$Geeks Output : String is not accepted. Input : Geeks For Geeks Output : String is accepted
Approach : Make a regular expression(regex) object of all the special characters that we don’t want, then pass a string in search method. If any one character of string is matching with regex object then search method returns a match object otherwise return None.
Below is the implementation :
C++
// C++ program to check if a string // contains any special character // import required packages#include <iostream> #include <regex> using namespace std; // Function checks if the string // contains any special charactervoid 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$Geeks"; // Calling run function run(str); return 0; } // This code is contributed by Yash_R |
Python3
# Python3 program to check if a string# contains any special character # import required packageimport re # Function checks if the string# contains any special characterdef run(string): # Make own character set and pass # this as argument in compile method regex = re.compile('[@_!#$%^&*()<>?/\|}{~:]') # 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 Codeif __name__ == '__main__' : # Enter the string string = "Geeks$For$Geeks" # calling run function run(string) |
PHP
<?Php// PHP program to check if a string // contains any special character // Function checks if the string // contains any special character function run($string){ $regex = preg_match('[@_!#$%^&*()<>?/\|}{~:]', $string); if($regex) print("String is accepted"); else print("String is not accepted.");} // Driver Code // Enter the string $string = 'Geeks$For$Geeks'; // calling run functionrun($string); // This code is contributed by Aman ojha?> |
Output :
String is not accepted.
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