Issue with REGEXP_ONLY_DIGITS Flag in @ngxpert/input-otp

[germanho1102]

During implementation, I encountered an issue with the REGEXP_ONLY_DIGITS flag, which I intended to use to restrict input to digits only. However, it appears that this flag is not working as expected, as non-digit inputs (e.g. alphabets, punctuation) are still being accepted. I was able to replicate this issue in the demo as well.

html.file
`<form
[class]="cn('mx-auto flex max-w-[980px] justify-center pt-6 pb-4', className)"
(ngSubmit)="onSubmit()"

<input-otp
#otp="inputOtp"
[maxLength]="6"
[pattern]="REGEXP_ONLY_DIGITS"
[(ngModel)]="otpValue"
(complete)="onComplete($event)"
containerClass="group flex items-center has-[:disabled]:opacity-30"
aria-label="showcase-otp-input"
name="otp"
[disabled]="disabled()"

<div class="flex">
  @for (
    slot of otp.slots().slice(0, 6);
    track $index;
    let first = $first;
    let last = $last
  ) {
    <app-slot
      [isActive]="slot.isActive"
      [char]="slot.char"
      [placeholderChar]="slot.placeholderChar"
      [hasFakeCaret]="slot.hasFakeCaret"
      [animateIdx]="$index"
      [first]="first"
      [last]="last"
    />
  }
</div>

`

ts file
`export class OtpComponent {
otpValue = '6';
REGEXP_ONLY_DIGITS = REGEXP_ONLY_DIGITS;
cn = cn;
@input() className = '';

otp = viewChild(InputOTPComponent);
disabled = signal(false);
t1: ReturnType | undefined;
t2: ReturnType | undefined;

onComplete(value: string) {
console.log('OTP completed:', value);
}

ngOnDestroy() {
clearTimeout(this.t1);
clearTimeout(this.t2);
}
}
`

[shhdharmen]

Created issue #4