regexbuddy

RegexBuddy

regexbuddy allows you to implement common regex functionality in your code, using a simplified syntax. Currently, regexbuddy has functions for regex-based password validation, as well as array duplicate functions. The array functions - along with other features - are being added, and a new version is released weekly.

Installation

Install in your project locally:

npm install regexbuddy

Implement into your project

Step 1: Import into your project

NOTE: Since regexbuddy has function names that are considered generic (i.e. password(input).validate()), it's recommended to import it like this:

import * as regexBuddy from "regexbuddy";

Step 2: That way, you can use it in your code like this

regexBuddy.password(input).validate();

COMMENT: While having generic-sounding function names is a (rightfully) contested topic, doing so makes the syntax feel more natural. And implementing it like the example above makes it easier to find where regexbuddy is used in your code, because the functions are prefixed with regexBuddy.

Available Functions and Methods

Password Validation

For password validation, you can simply use:

regexBuddy.password(input).validate();

This takes the input value you pass in as an argument, and validates against the default password requirements.

Default requirements are that a password must contain (with the option name and data type for overwriting defaults):

1. At least one uppercase letter (name: requireUpperCase, type: boolean)
2. At least one lowercase letter (name: requireLowerCase, type: boolean)
3. At least one number (name: requireNumber, type: boolean)
4. At least one special character (name: requireSpecialCharacter, type: boolean)
5. A minimum of 5 characters (name: minLength, type: number)

The default requirements can be overwritten by passing in your requirements in the validate function like this:

regexBuddy.password(input).validate({ minLength: 8, requireSpecialCharacter: false });

NOTE: Options that are ignored will still have their default values used. So in the example above, a password must have at least 8 characters and does not need to have a number. But it must also still include an uppercase letter, lowercase letter, and a special character.

NOTE: The password validation method returns an object structured like this:

{
  valid: boolean,
  errors: [ validationErrors ] || null
}

This gives you the option of serving the client an array of the criteria not met when creating a password, or simply using the password validation method in a conditional expression. And the valid property was added for those who prefer using explicit conditional evaluation over implicit "truthy" methods for something like a password.

An example of how to use this in your code would be:

const passwordCheck = regexBuddy.password(input).validate({ minlength: 8, requireSpecialCharacter: false });

This would let you reference the passwordCheck variable in a simple way, like these examples:

// If a password is invalid
if (passwordCheck.errors) {
  // You can then map the array of errors in passwordCheck.errors to a DOM object, like a toast, modal, etc.
  ...
}

Or implement as a simple, explicit conditional in your corresponding template file, like this example, where a submit button is disabled when there are any errors with the user's input value:

<button type="submit" disabled={!passwordCheck.valid}>Submit</button>