Java: Validate a given phone number
22. Validate Phone Number
Write a Java program to validate a phone number.
Following are valid phone number examples:
“(123)4567890", "1234567890", "123-456-7890", "(123)456-7890",
Following are invalid phone numbers:
"(1234567890)","123)4567890", "12345678901", "(1)234567890", "(123)-4567890", "1", "12-3456-7890", "123-4567", "Hello world"};
- Regex explanation:
- ^\\(? - May start with an option "("
- (\\d{3}) - Followed by 3 digits
- \\)? - May have an optional ")"
- [- ]? - May have an optional "-" after the first 3 digits or after optional ) character
- (\\d{3}) - Followed by 3 digits.
- [- ]? - May have another optional "-" after numeric digits
- (\\d{4})$ - ends with four digits
Sample Solution:
Java Code:
//Ref.https://bit.ly/33gB1TY
public class test {
public static void main(String[] args) {
String text ="(123)4567890";
System.out.println("Original Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="(123)4567890";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="1234567890";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="123-456-7890";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="(1234567890)";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="123)4567890";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="12345678901";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="(1)234567890";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="(123)-4567890";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="1";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="12-3456-7890";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
text ="123-4567";
System.out.println("\nOriginal Phone number: "+text);
System.out.println("Check the said Phone number is true or not! "+validate(text));
}
public static Boolean validate(String text) {
return text.matches("\\d{10}|(?:\\d{3}-){2}\\d{4}|\\(\\d{3}\\)\\d{3}-?\\d{4}");
}
}
Sample Output:
Original Phone number: (123)4567890 Check the said Phone number is true or not! true Original Phone number: (123)4567890 Check the said Phone number is true or not! true Original Phone number: 1234567890 Check the said Phone number is true or not! true Original Phone number: 123-456-7890 Check the said Phone number is true or not! true Original Phone number: (1234567890) Check the said Phone number is true or not! false Original Phone number: 123)4567890 Check the said Phone number is true or not! false Original Phone number: 12345678901 Check the said Phone number is true or not! false Original Phone number: (1)234567890 Check the said Phone number is true or not! false Original Phone number: (123)-4567890 Check the said Phone number is true or not! false Original Phone number: 1 Check the said Phone number is true or not! false Original Phone number: 12-3456-7890 Check the said Phone number is true or not! false Original Phone number: 123-4567 Check the said Phone number is true or not! false
Flowchart :
For more Practice: Solve these Related Problems:
- Write a Java program to validate a phone number format that allows optional country codes and separators using regex.
- Write a Java program to check if a string is a valid phone number based on a specified pattern with dashes and parentheses.
- Write a Java program to implement a method that returns true if the input string matches a standardized phone number format.
- Write a Java program to validate phone numbers that may include spaces, dashes, and brackets using a comprehensive regex.
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