In
Ensures the value of a given field matches one of expected values.
#Directive Code Snippet
<!DOCTYPE html>
<html lang="en">
...
<form (ngSubmit)="onSubmit(form)" #form="ngForm">
<input [in]="<array of values>" 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]="in:<comma separted value>" type="text" name="<name>" [(ngModel)]="<name>" #<name>="ngModel">
</form>
...
</html>