Validator that requires the control's value to be greater than or equal to the provided number.

Validator that requires the control's value to be less than or equal to the provided number.

Validator that requires the control have a non-empty value.

Validator that requires the control's value be true. This validator is commonly used for required checkboxes.

Validator that requires the control's value pass an email validation test.

Tests the value using a regular expression pattern suitable for common use cases. The pattern is based on the definition of a valid email address in the WHATWG HTML specification with some enhancements to incorporate more RFC rules (such as rules related to domain names and the lengths of different parts of the address).

The differences from the WHATWG version include:

• Disallow local-part (the part before the @ symbol) to begin or end with a period (.).
• Disallow local-part to be longer than 64 characters.
• Disallow the whole address to be longer than 254 characters.

If this pattern does not satisfy your business needs, you can use Validators.pattern() to validate the value against a different pattern.

Validator that requires the number of items in the control's value to be greater than or equal to the provided minimum length. This validator is also provided by default if you use the HTML5 minlength attribute. Note that the minLength validator is intended to be used only for types that have a numeric length or size property, such as strings, arrays or sets. The minLength validator logic is also not invoked for values when their length or size property is 0 (for example in case of an empty string or an empty array), to support optional controls. You can use the standard required validator if empty values should not be considered valid.

const control = new FormControl('ng', Validators.minLength(3));console.log(control.errors); // {minlength: {requiredLength: 3, actualLength: 2}}

Validator that requires the number of items in the control's value to be less than or equal to the provided maximum length. This validator is also provided by default if you use the HTML5 maxlength attribute. Note that the maxLength validator is intended to be used only for types that have a numeric length or size property, such as strings, arrays or sets.

const control = new FormControl('Angular', Validators.maxLength(5));console.log(control.errors); // {maxlength: {requiredLength: 5, actualLength: 7}}

Validator that requires the control's value to match a regex pattern. This validator is also provided by default if you use the HTML5 pattern attribute.

const control = new FormControl('1', Validators.pattern('[a-zA-Z ]*'));console.log(control.errors); // {pattern: {requiredPattern: '^[a-zA-Z ]*$', actualValue: '1'}}

<input pattern="[a-zA-Z ]*">

Validator that performs no operation.

Compose multiple validators into a single function that returns the union of the individual error maps for the provided control.

@returnsnull

Compose multiple async validators into a single function that returns the union of the individual error objects for the provided control.