@angular/forms/signals

pattern

function

stablesince v22.0

Binds a validator to the given path that requires the value to match a specific regex pattern. This function can only be called on string paths. In addition to binding a validator, this function adds PATTERN property to the field.

API

function pattern<TPathKind extends PathKind = PathKind.Root>(
  path: SchemaPath<string, 1, TPathKind>,
  pattern: RegExp | LogicFn<string | undefined, RegExp | undefined, TPathKind>,
  config?: BaseValidatorConfig<string, TPathKind> | undefined,
): void;

@parampathSchemaPath<string, 1, TPathKind>

Path of the field to validate

@parampatternRegExp | LogicFn<string | undefined, RegExp | undefined, TPathKind>

The RegExp pattern to match, or a LogicFn that returns the RegExp pattern.

@paramconfigBaseValidatorConfig<string, TPathKind> | undefined

Optional, allows providing any of the following options:

error: Custom validation error(s) to be used instead of the default patternError() or a function that receives the FieldContext and returns custom validation error(s).

@returnsvoid