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Regular Expressions to Validate ISBN Code
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Regular Expressions to Validate ISBN Code
- Last Updated : 15 Dec, 2022
Given some ISBN Codes, the task is to check if they are valid or not using regular expressions. Rules for the valid codesare:
- It is a unique 10 or 13-digit.
- It may or may not contain a hyphen.
- It should not contain whitespaces and other special characters.
- It does not allow alphabet letters.
Examples:
Input: str = ”978-1-45678-123-4″
Output: TrueInput: str = ”ISBN446877428FCI″
Output: False
Explanation: It should contain digits and hyphens only.
Approach: The problem can be solved based on the following idea:
Create a regex pattern to validate the number as written below:
regex = “^(?=(?:[^0-9]*[0-9]){10}(?:(?:[^0-9]*[0-9]){3})?$)[\d-]+$“Where,
- ^: Represents the beginning of the string.
- ?: Either it contains or not.
- $: Ending of the string.
Follow the below steps to implement the idea:
- Create a regex expression for ISBN Codes.
- Use Pattern class to compile the regex formed.
- Use the matcher function to check whether the ISBN Codes is valid or not.
- If it is valid, return true. Otherwise, return false.
Below is the implementation of the above approach.
- Python3
- Javascript
// Java program to validate the
// ISBN Code using Regular Expression
import java.util.regex.*;
class GFG {
// Function to validate the
// ISBN Code
public static boolean isValidISBNCode(String str)
{
// Regex to check valid ISBN Code
String regex
= "^(?=(?:[^0-9]*[0-9]){10}(?:(?:[^0-9]*[0-9]){3})?$)[\\d-]+$";
// Compile the ReGex
Pattern p = Pattern.compile(regex);
// If the str
// is empty return false
if (str == null) {
return false;
}
// Pattern class contains matcher() method
// to find matching between given
// str using regular expression.
Matcher m = p.matcher(str);
// Return if the str
// matched the ReGex
return m.matches();
}
// Driver Code.
public static void main(String args[])
{
// Test Case 1:
String str1 = "978-1-45678-123-4";
System.out.println(isValidISBNCode(str1));
// Test Case 2:
String str2 = "1-56619-909-3";
System.out.println(isValidISBNCode(str2));
// Test Case 3:
String str3 = "1207199818865";
System.out.println(isValidISBNCode(str3));
// Test Case 4:
String str4 = "978-1-12345-909-4 2";
System.out.println(isValidISBNCode(str4));
// Test Case 5:
String str5 = "ISBN446877428FCI";
System.out.println(isValidISBNCode(str5));
}
}Output
true true true false false
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