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ulid

Validate that a string is a syntactically valid ULID — 26 characters in Crockford base32 (excludes I, L, O, U).

Signature​

NguardValidators.String.ulid: ValidatorFn

A parameterless validator — used directly without invocation.

Reactive forms​

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

const id = new FormControl('', [NguardValidators.String.ulid]);

Template-driven forms​

<input ngModel name="id" nguardUlid />

Error key​

{ ulid: true }

Notes​

  • Validates shape, not chronological monotonicity or generator integrity.
  • Pattern (case-insensitive): ^[0-9A-HJKMNP-TV-Z]{26}$.
  • Empty strings fail.

See also​

  • uuid — alternative identifier format (RFC 4122)
  • regex — for custom identifier shapes