Angular 4 : Validators.pattern() not working

i am trying to validate input type="text" using pattern , i want only text.

Component :

this.from = this.fb.group({
name: ['',Validators.required,Validators.pattern('^[a-zA-Z]+$')],
});


Html :

<input type="text" formControlName="name"/>


I have have also tried :

this.from = this.fb.group({
name: ['',Validators.required,Validators.pattern(/^[a-zA-Z]+$/)],
});


with no effect. Angular 4

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