How to validate email in angular 4 using formgroup or custom regexp?
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Answer / Digvijay Bisht
To validate an email input field in Angular 4, you can use FormGroup and a custom validator function. First, define the FormGroup for your form:
```typescript
emailFormControl = new FormControl('', [Validators.required, this.validateEmail]);
```
Create a custom validateEmail function to check the email format using a regular expression:
```typescript
validateEmail(control: AbstractControl) {
const regex = new RegExp(/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,}$/);
return (regex.test(control.value)) ? null : {'invalidEmail': true};
}
```
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