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en.wikipedia.org/wiki/Validator

A validator is a computer program used to check the validity or syntactical correctness of a fragment of code or document. The term is commonly used in the  ...

angular.io/api/forms/Validators

Provides a set of validators used by form controls. A validator is a function that processes a FormControl or collection of controls and returns a map of errors.

validator.w3.org

W3C's easy-to-use markup validation service, based on SGML and XML parsers.

www.npmjs.com/package/validator

<script type="text/javascript">. validator.isEmail('foo@bar.com'); //=> true. </script >. The library can also be installed through bower. $ bower install validator-js ...

formvalidation.io/validators

Validators. The richest validators in the class. FormValidation comes with various built-in validators listed in the alphabetical order as following: ...

docs.djangoproject.com/en/1.11/ref/validators

A validator is a callable that takes a value and raises a ValidationError if it doesn't meet some criteria. Validators can be useful for re-using validation logic ...

github.com/angular/angular/blob/master/packages/forms/src/validators.ts

export const NG_VALIDATORS = new InjectionToken<Array<Validator|Function> >('NgValidators');. /**. * Providers for asynchronous validators to be used for ...

www.formencode.org/en/latest/modules/validators.html

Under Python 2.x you can also use the alias String for this validator. Also takes a max and min argument, and the string length must fall in that range. Also you ...

pypi.python.org/pypi/validators

validators 0.12.0. Download validators-0.12.0.tar.gz. Python Data Validation for Humans™. Python Data Validation for Humans™.