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notRegex

Validate that a string does not match a given regular expression.

Signature​

NguardValidators.String.notRegex(pattern: RegExp): ValidatorFn
ParameterTypeDescription
patternRegExpThe pattern that must not match the input

Reactive forms​

import { FormControl } from '@angular/forms';
import { NguardValidators } from 'ng-nguard';

// Reject any digit in the username
const username = new FormControl('', [
    NguardValidators.String.notRegex(/\d/),
]);

Template-driven forms​

<input ngModel name="username" [nguardNotRegex]="/\d/" />

Error key​

{ notRegex: true }

Notes​

  • Returns null (valid) if the pattern does not match.
  • Returns { notRegex: true } if the pattern matches.
  • null, undefined, non-string inputs all fail.

See also​

  • regex — opposite check (must match)