NotRegex
The Not Regex rule checks that a field's value does NOT match a given pattern — the direct opposite of the Regex rule — and, like Regex, the pattern can be passed either as a plain string or as a native RegExp object. It's the natural fit for blocking a specific shape rather than requiring one, such as rejecting a username that contains a digit with not_regex:(?=.*[0-9]), keeping a display name free of emoji or non-Latin characters, or disallowing a slug that starts with a reserved prefix. Reach for the Regex rule instead when the field should match a pattern rather than avoid one.
#Directive Code Snippet
<!DOCTYPE html>
<html lang="en">
...
<form (ngSubmit)="onSubmit(form)" #form="ngForm">
<input notRegex="<EXPRESSION>" type="text" name="<name>" [(ngModel)]="<name>" #<name>="ngModel">
<ng-absolute-validator [formInstance]="<name>"></ng-absolute-validator>
</form>
...
</html>
#Chain Rule Code Snippet
<!DOCTYPE html>
<html lang="en">
...
<form (ngSubmit)="onSubmit(form)" #form="ngForm">
<input rule="not_regex:<EXPRESSION>" type="text" name="<name>" [(ngModel)]="<name>" #<name>="ngModel">
<ng-absolute-validator [formInstance]="<name>"></ng-absolute-validator>
</form>
...
</html>
#Reactive Form Code Snippet
//component.ts
export class ReactiveComponent{
public form !: FormGroup;
constructor(
private fb : FormBuilder,
private rv : ReactiveValidator,
){this.generteForm()}
generteForm(){
this.form = this.fb.group({
<name> : ['',this.rv.map('not_regex:<EXPRESSION>',<CUSTOM_MESSAGE>)]
})
}
}
//component.html
<!DOCTYPE html>
<html lang="en">
...
<form [formGroup]="form">
<input type="text" name="<name>" formControlName="<name>">
<ng-absolute-validator [formInstance]="form.get(<name>)"></ng-absolute-validator>
</form>
...
</html>