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Regular Expressions to validate Loan Account Number (LAN)

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Given some Loan Account Number(LAN), the task is to check if they are valid or not using regular expressions. Rules for the valid Loan Account Number are:

  • LAN is an alphanumeric string i.e., contains only digits (0-9) and uppercase alphabet characters.
  • It does not allow whitespaces in it.
  • It does not contain special characters.
  • It starts with Uppercase alphabets and ends with digits.

Examples:

Input: str = ”AZA22E001144075?
Output: True

Input: str = ”Abc9136812895?
Output: False
Explanation: As it contains lowercase alphabets characters such as b and c.

Approach: The problem can be solved based on the following idea:

Create a regex pattern to validate the Loan Account Number as written below:   
regex=”^[A-Z]{2, }[0-9]{2, }[A-Z]{1, }[0-9]{5, }$

  • ^ : Beginning of the string.
  • [A – Z]{2, }: This pattern will match two or more than two preceding items if they are in the range A to Z.
  • [0 – 9]{2, }:  This pattern will match two or more than two preceding items if they are in the range 0 to 9..
  • $: End of the string

Follow the below steps to implement the idea:

  • Create a regex expression for Loan Account Number.
  • Use Pattern class to compile the regex formed.
  • Use the matcher function to check whether the   Loan Account Number  is valid or not.
  • If it is valid, return true. Otherwise, return false.

Below is the code implementation of the above-discussed approach:

Java




// Java program to validate the
// LOAN ACCOUNT NUMBER using
// Regular Expression
 
import java.util.regex.*;
 
class GFG {
 
    // Function to validate the
    // LOAN ACCOUNT NUMBER
    // (For India Country Only)
    public static boolean isValidLoanAccNumber(String str)
    {
 
        // Regex to check valid
        // LOAN ACCOUNT NUMBER
        String regex
            = "^[A-Z]{2, }[0-9]{2, }[A-Z]{1, }[0-9]{5, }$";
 
        // 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 regex
        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 = "AZA22E001144075";
        System.out.println(isValidLoanAccNumber(str1));
 
        // Test Case 2:
        String str2 = "AZA@123";
        System.out.println(isValidLoanAccNumber(str2));
 
        // Test Case 3:
        String str3 = "AZA22E00 1144075";
        System.out.println(isValidLoanAccNumber(str3));
 
        // Test Case 4:
        String str4 = "@934517865";
        System.out.println(isValidLoanAccNumber(str4));
 
        // Test Case 5:
        String str5 = "AZA1234_123";
        System.out.println(isValidLoanAccNumber(str5));
    }
}


C#




// C# program to validate the
// LOAN ACCOUNT NUMBER
// using Regular Expressions
using System;
using System.Text.RegularExpressions;
class GFG {
 
    // Main Method
    static void Main(string[] args)
    {
 
        // Input strings to Match
        // LOAN ACCOUNT NUMBER
        string[] str = { "AZA22E001144075", "AZA@123",
                         "AZA22E00 1144075", "@934517865",
                         "AZA1234_123" };
        foreach(string s in str)
        {
            Console.WriteLine(
                isValidLoanAccNumber(s) ? "true" : "false");
        }
        Console.ReadKey();
    }
 
    // method containing the regex
    public static bool isValidLoanAccNumber(string str)
    {
        string strRegex
            = @"^[A-Z]{2, }[0-9]{2, }[A-Z]{1, }[0-9]{5, }$";
        Regex re = new Regex(strRegex);
        if (re.IsMatch(str))
            return (true);
        else
            return (false);
    }
}


C++




// C++ program to validate the
// LOAN ACCOUNT NUMBER using Regular
// Expression
 
#include <iostream>
#include <regex>
using namespace std;
 
// Function to validate the
// LOAN ACCOUNT NUMBER
bool isValidLoanAccNumber(string str)
{
 
    // Regex to check valid
    // LOAN ACCOUNT NUMBER
    const regex pattern(
        "^[A-Z]{2, }[0-9]{2, }[A-Z]{1, }[0-9]{5, }$");
 
    // If the
    // is empty return false
    if (str.empty()) {
        return false;
    }
 
    // Return true if the str
    // matched the ReGex
    if (regex_match(str, pattern)) {
        return true;
    }
    else {
        return false;
    }
}
 
// Driver Code
int main()
{
    // Test Case 1:
    string str1 = "AZA22E001144075";
    cout << isValidLoanAccNumber(str1) << endl;
 
    // Test Case 2:
    string str2 = "AZA@123";
    cout << isValidLoanAccNumber(str2) << endl;
 
    // Test Case 3:
    string str3 = "AZA22E00 1144075";
    cout << isValidLoanAccNumber(str3) << endl;
 
    // Test Case 4:
    string str4 = "@934517865";
    cout << isValidLoanAccNumber(str4) << endl;
 
    // Test Case 5:
    string str5 = "AZA1234_123";
    cout << isValidLoanAccNumber(str5) << endl;
 
    return 0;
}


Python3




# Python3 program to validate
# LOAN ACCOUNT NUMBER using Regular Expression
import re
 
# Function to validate
# LOAN ACCOUNT NUMBER
 
 
def isValidLoanAccNumber(str):
 
    # Regex to check valid LOAN ACCOUNT NUMBER
    regex = "^[A-Z]{2, }[0-9]{2, }[A-Z]{1, }[0-9]{5, }$"
 
    # 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 = "AZA22E001144075"
print(isValidLoanAccNumber(str1))
 
# Test Case 2:
str2 = "AZA@123"
print(isValidLoanAccNumber(str2))
 
# Test Case 3:
str3 = "AZA22E00 1144075"
print(isValidLoanAccNumber(str3))
 
# Test Case 4:
str4 = "@934517865"
print(isValidLoanAccNumber(str4))
 
# Test Case 5:
str5 = "AZA1234_123"
print(isValidLoanAccNumber(str5))


PHP




<?php
// PHP program to validate LOAN ACCOUNT NUMBER
// Function to validate LOAN ACCOUNT NUMBER using regular expression
function isValidLoanAccNumber($str){
if(preg_match('/^[A-Z]{2, }[0-9]{2, }[A-Z]{1, }[0-9]{5, }$/', $str)) {
echo "true\n";
} else {
echo "false\n";
}
}
isValidLoanAccNumber("AZA22E001144075");
isValidLoanAccNumber("AZA@123");
isValidLoanAccNumber("AZA22E00 1144075");
isValidLoanAccNumber("@934517865");
isValidLoanAccNumber("AZA1234_123");
?>


Javascript




// Javascript program to validate
// LOAN ACCOUNT NUMBER using Regular Expression
 
// Function to validate the
// LOAN ACCOUNT NUMBER
function isValidLoanAccNumber(str) {
    // Regex to check valid
    // LOAN ACCOUNT NUMBER
    let regex = new RegExp(/^[A-Z]{2, }[0-9]{2, }[A-Z]{1, }[0-9]{5, }$/);
 
    // 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 = "AZA22E001144075";
console.log(isValidLoanAccNumber(str1));
 
// Test Case 2:
let str2 = "AZA@123";
console.log(isValidLoanAccNumber(str2));
 
// Test Case 3:
let str3 = "AZA22E00 1144075";
console.log(isValidLoanAccNumber(str3));
 
// Test Case 4:
let str4 = "@934517865";
console.log(isValidLoanAccNumber(str4));
 
// Test Case 5:
let str5 = "AZA1234_123";
console.log(isValidLoanAccNumber(str5));


Output

true
false
false
false
false

Time complexity: O(n). // where n is length of the string.

Auxiliary Space: O(1).

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Last Updated : 09 Feb, 2023
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