How to validate GUID (Globally Unique Identifier) using Regular Expression
Last Updated : 19 Dec, 2022
Given string str, the task is to check whether the given string is a valid GUID (Globally Unique Identifier) or not by using Regular Expression.
The valid GUID (Globally Unique Identifier) must specify the following conditions:
- It should be a 128-bit number.
- It should be 36 characters (32 hexadecimal characters and 4 hyphens) long.
- It should be displayed in five groups separated by hyphens (-).
- Microsoft GUIDs are sometimes represented with surrounding braces.
Examples:
Input: str = "123e4567-e89b-12d3-a456-9AC7CBDCEE52"
Output: true
Explanation:
The given string satisfies all the above mentioned conditions. Therefore, it is a valid GUID (Globally Unique Identifier).
Input: str = "123e4567-h89b-12d3-a456-9AC7CBDCEE52"
Output: false
Explanation:
The given string contains 'h', the valid hexadecimal characters should be followed by character from a-f, A-F, and 0-9. Therefore, it is not a valid GUID (Globally Unique Identifier).
Input: str = "123e4567-h89b-12d3-a456"
Output: false
Explanation:
The given string has 20 characters. Therefore, it is not a valid GUID (Globally Unique Identifier).
Approach: The idea is to use Regular Expression to solve this problem. The following steps can be followed to compute the answer:
- Get the String.
- Create a regular expression to check valid GUID (Globally Unique Identifier) as mentioned below:
regex = "^[{]?[0-9a-fA-F]{8}-([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}[}]?$"
- Where:
- ^ represents the starting of the string.
- [{]? represents the '{' character that is optional.
- [0-9a-fA-F]{8} represents the 8 characters from a-f, A-F, and 0-9.
- - represents the hyphens.
- ([0-9a-fA-F]{4}-){3} represents the 4 characters from a-f, A-F, and 0-9 that is repeated 3 times separated by a hyphen (-).
- [0-9a-fA-F]{12} represents the 12 characters from a-f, A-F, and 0-9.
- [}]? represents the '}' character that is optional.
- $ represents the ending of the string.
- Match the given string with the Regular Expression. In Java, this can be done by using Pattern.matcher().
- Return true if the string matches with the given regular expression, else return false.
Below is the implementation of the above approach:
C++ // C++ program to validate the // GUID (Globally Unique Identifier) using Regular Expression #include <iostream> #include <regex> using namespace std; // Function to validate the GUID (Globally Unique Identifier). bool isValidGUID(string str) { // Regex to check valid GUID (Globally Unique Identifier). const regex pattern("^[{]?[0-9a-fA-F]{8}-([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}[}]?$"); // If the GUID (Globally Unique Identifier) // is empty return false if (str.empty()) { return false; } // Return true if the GUID (Globally Unique Identifier) // matched the ReGex if(regex_match(str, pattern)) { return true; } else { return false; } } // Driver Code int main() { // Test Case 1: string str1 = "123e4567-e89b-12d3-a456-9AC7CBDCEE52"; cout << isValidGUID(str1) << endl; // Test Case 2: string str2 = "{123e4567-e89b-12d3-a456-9AC7CBDCEE52}"; cout << isValidGUID(str2) << endl; // Test Case 3: string str3 = "123e4567-h89b-12d3-a456-9AC7CBDCEE52"; cout << isValidGUID(str3) << endl; // Test Case 4: string str4 = "123e4567-h89b-12d3-a456"; cout << isValidGUID(str4) << endl; return 0; } // This code is contributed by yuvraj_chandra // Java program to validate // GUID (Globally Unique Identifier) // using regular expression import java.util.regex.*; class GFG { // Function to validate // GUID (Globally Unique Identifier) // using regular expression public static boolean isValidGUID(String str) { // Regex to check valid // GUID (Globally Unique Identifier) String regex = "^[{]?[0-9a-fA-F]{8}" + "-([0-9a-fA-F]{4}-)" + "{3}[0-9a-fA-F]{12}[}]?$"; // Compile the ReGex Pattern p = Pattern.compile(regex); // If the string is empty // return false if (str == null) { return false; } // Find match between given string // and regular expression // uSing Pattern.matcher() Matcher m = p.matcher(str); // Return if the string // matched the ReGex return m.matches(); } // Driver code public static void main(String args[]) { // Test Case 1: String str2 = "123e4567-e89b-12d3" + "-a456-9AC7CBDCEE52"; System.out.println( isValidGUID(str2)); // Test Case 2: String str3 = "{123e4567-e89b-12d3-" + "a456-9AC7CBDCEE52}"; System.out.println( isValidGUID(str3)); // Test Case 3: String str1 = "123e4567-h89b-12d3-a456" + "-9AC7CBDCEE52"; System.out.println( isValidGUID(str1)); // Test Case 4: String str4 = "123e4567-h89b-12d3-a456"; System.out.println( isValidGUID(str4)); } } # Python3 program to validate # GUID (Globally Unique Identifier) # using regular expression import re # Function to validate GUID # (Globally Unique Identifier) def isValidGUID(str): # Regex to check valid # GUID (Globally Unique Identifier) regex = "^[{]?[0-9a-fA-F]{8}" + "-([0-9a-fA-F]{4}-)" + "{3}[0-9a-fA-F]{12}[}]?$" # Compile the ReGex p = re.compile(regex) # If the string is empty # return false if (str == None): return False # Return if the string # matched the ReGex if(re.search(p, str)): return True else: return False # Driver code # Test Case 1: str1 = "123e4567-e89b-12d3" + "-a456-9AC7CBDCEE52" print(isValidGUID(str1)) # Test Case 2: str2 = "{123e4567-e89b-12d3-" + "a456-9AC7CBDCEE52}" print(isValidGUID(str2)) # Test Case 3: str3 = "123e4567-h89b-12d3-a456" + "-9AC7CBDCEE52" print(isValidGUID(str3)) # Test Case 4: str4 = "123e4567-h89b-12d3-a456" print(isValidGUID(str4)) # This code is contributed by avanitrachhadiya2155 // C# program to validate // GUID (Globally Unique Identifier) using Regular Expression using System; using System.Text.RegularExpressions; class GFG { // Main Method static void Main(string[] args) { // Input strings to Match //GUID (Globally Unique Identifier) string[] str={"123e4567-e89b-12d3-a456-9AC7CBDCEE52","{123e4567-e89b-12d3-a456-9AC7CBDCEE52}","123e456-h89b-12d3-a456-9AC7CBDCEE52","123e4567-h89b-12d3-a456"}; foreach(string s in str) { Console.WriteLine( isValidGUID(s) ? "true" : "false"); } Console.ReadKey(); } // method containing the regex public static bool isValidGUID(string str) { string strRegex = @"^[{]?[0-9a-fA-F]{8}-([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}[}]?$"; Regex re = new Regex(strRegex); if (re.IsMatch(str)) return (true); else return (false); } } // This code is contributed by Rahul Chauhan // Javascript program to validate // GUID (Globally Unique Identifier) using Regular Expression // Function to validate the // GUID function isValidGUID(str) { // Regex to check valid // GUID let regex = new RegExp(/^[{]?[0-9a-fA-F]{8}-([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}[}]?$/); // if str // is empty return false if (str == null) { return "false"; } // Return true if the str // matched the ReGex if (regex.test(str) == true) { return "true"; } else { return "false"; } } // Driver Code // Test Case 1: let str1 = "123e4567-e89b-12d3" + "-a456-9AC7CBDCEE52"; console.log(isValidGUID(str1)); // Test Case 2: let str2 = "{123e4567-e89b-12d3-" + "a456-9AC7CBDCEE52}"; console.log(isValidGUID(str2)); // Test Case 3: let str3 = "123e4567-h89b-12d3-a456" + "-9AC7CBDCEE52"; console.log(isValidGUID(str3)); // Test Case 4: let str4 = "123e4567-h89b-12d3-a456"; console.log(isValidGUID(str4)); // This code is contributed by Rahul Chauhan Output: true true false false
Time Complexity: O(N) for each test case, where N is the length of the given string.
Auxiliary Space: O(1)