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 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
<?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 function run( $string ); // This code is contributed by Aman ojha ?> |
Output :
String is not accepted.
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