Utilize Regular Expression Constant Validator in Angular 8's Reactive Formbuilder for efficient data validation requirements

Is there a way to efficiently store and reuse a Regex Validator pattern in Angular while following the DRY principle? I have a reactive formbuilder with a Regex validator pattern for ZipCode that I need to apply to multiple address forms.

I'm interested in saving the pattern /^\d{1,5}$/ so that we can simply use Validators.pattern(zipcode) or a similar syntax in Angular. My company also has more complex patterns for phone numbers, customer numbers, etc.

'ZipCode': [null, [Validators.maxLength(16), Validators.pattern(/^\d{1,5}$/)]],

I am looking for a way to store and easily utilize these patterns, possibly in constants.

Specifically, I am working with Angular 2:

ng-pattern to use regex from angular constants

angulartypescriptangular-reactive-formsangular8

Answer №1

If you want to keep your validations organized, you can store them in separate .ts files, such as validations.ts.

These validations can then be easily used wherever needed, including having parameter Validators.

validation.ts

export const ZipValidation = Validators.pattern(/^\d{1,5}$/);
export const EmailValidation = Validators.pattern(/*some regex*/);
export const UsernameValidation = Validators.pattern(/*some regex*/);
export const ValidWithParam = (param: number) => {
  return Validators.pattern('/\d' + param + '/g');
}

In Component

import { ZipValidation, EmailValidation, UsernameValidation } from './validation';
'ZipCode': [null, [Validators.maxLength(16), ZipValidation]],

Answer №2

The most effective approach is to centralize all patterns in a root-level shared service.

By utilizing the shared service when needed, you can easily access the patterns. Additionally, consider creating an endpoint within this service to allow configuration of Validators through your application backend.

If this is not feasible, you can always manually input the Validators patterns directly into the service.

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