Username Validation using single regex string to test for all conditions

readme.md

Codeland Username Validation Have the function CodelandUsernameValidation(str) take the str parameter being passed and determine if the string is a valid username according to the following rules:

1. The username is between 4 and 25 characters.
2. It must start with a letter.
3. It can only contain letters, numbers, and the underscore character.
4. It cannot end with an underscore character.

If the username is valid then your program should return the string true, otherwise return the string false.

Examples

Input: "aa_"
Output: false

Input: "u__hello_world123"
Output: true

index.js

// Codeland Username Validation
// Have the function CodelandUsernameValidation(str) take the str parameter being passed and determine if the string is a valid username according to the following rules:

// 1. The username is between 4 and 25 characters.
// 2. It must start with a letter.
// 3. It can only contain letters, numbers, and the underscore character.
// 4. It cannot end with an underscore character.

// If the username is valid then your program should return the string true, otherwise return the string false.

// UNIFIED REGEX SOLUTION

function CodelandUsernameValidation(str) { 
  const unifiedRegex = /^[A-Za-z][\w\d]{2,23}[A-Za-z0-9]$/

  return (unifiedRegex.test(str))
}
   
// keep this function call here 
module.exports = CodelandUsernameValidation;

validation.test.js

const CodelandUsernameValidation = require('../index.js');

test('CodelandUsernameValidation, u__hello', () => {
  expect(CodelandUsernameValidation('u__hello')).toBe(true);
});

test('CodelandUsernameValidation, User1234', () => {
  expect(CodelandUsernameValidation('User1234')).toBe(true);
});

test('CodelandUsernameValidation, 1234User', () => {
  expect(CodelandUsernameValidation('1234User')).toBe(false);
});

test('CodelandUsernameValidation, AlphaBeta22', () => {
  expect(CodelandUsernameValidation('AlphaBeta22')).toBe(true);
});

test('CodelandUsernameValidation, testUser_1', () => {
  expect(CodelandUsernameValidation('testUser_1')).toBe(true);
});

test('CodelandUsernameValidation, User_', () => {
  expect(CodelandUsernameValidation('User_')).toBe(false);
});

test('CodelandUsernameValidation, dev2024', () => {
  expect(CodelandUsernameValidation('dev2024')).toBe(true);
});

test('CodelandUsernameValidation, a', () => {
  expect(CodelandUsernameValidation('a')).toBe(false);
});

test('CodelandUsernameValidation, LongUsername_1234567890123456', () => {
  expect(CodelandUsernameValidation('LongUsername_1234567890123456')).toBe(false);
});

test('CodelandUsernameValidation, codeMaster', () => {
  expect(CodelandUsernameValidation('codeMaster')).toBe(true);
});

test('CodelandUsernameValidation, Special!User', () => {
  expect(CodelandUsernameValidation('Special!User')).toBe(false);
});