PhoneNo
Makes sure that the value of field under validation is a valid phone number. In default phone number is validate more than 10 Style of number.To override the default behaviour pass new regex expression to validate the number.
#Directive Code Snippet
<!DOCTYPE html>
<html lang="en">
...
<form (ngSubmit)="onSubmit(form)" #form="ngForm">
<input [phoneNo] type="text" name="<name>" [(ngModel)]="<name>" #<name>="ngModel">
</form>
...
</html>
#Chain Rule Code Snippet
<!DOCTYPE html>
<html lang="en">
...
<form (ngSubmit)="onSubmit(form)" #form="ngForm">
<input [Rule]="phone_no:<Regex exp specific Number>" type="text" name="<name>" [(ngModel)]="<name>" #<name>="ngModel">
</form>
...
</html>