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The function must be of type , or any derivative type.

I chose to make it Form Group, since that is the use case it’s for.

Thinking ahead a little, it is likely that you will allow a user to change their email address and password in a user update form as well, right? import from '@angular/forms'; import from '@angular/material'; /** * Custom validator functions for reactive form validation */ export class Custom Validators /** * Custom Error State Matcher which returns true (error exists) when the parent form group is invalid and the control has been touched */ export class Confirm Valid Parent Matcher implements Error State Matcher /** * Collection of reusable Reg Exps */ export const reg Exps: = ; /** * Collection of reusable error messages */ export const error Messages: = ; , on line 11.

Since I come from an object-oriented programming background, I chose to make this function a static class method, but you could just as easily make it a standalone function.

in the class, one for confirming the email address, and one for confirming the password.

The individual fields use appropriate validator functions, but both use a custom validator at the group level (lines 27 and 34), which checks to make sure that the fields in each group are equal to each other, and returns a validation error if they are not.

By default, the Persistence provider will automatically perform validation on entities with persistent fields or properties annotated with Bean Validation constraints immediately after the lifecycle events.) to show your validation errors, the implementation is non-trivial.I had to do a lot of research to figure this out, and there wasn’t a single source that gave me the whole answer.The combination of the custom validator for the groups and the error State Matcher directive is what provides us the complete functionality needed to appropriately show validation errors for the confirmation fields.Let’s take a look at the custom validation module to bring it all together.

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