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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  ...

validator.w3.org

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

www.npmjs.com/package/validator

Server-side usage. Install the library with npm install validator. var validator = require('validator');. validator.isEmail('foo@bar.com'); //=> true ...

validators.readthedocs.io

Each validator in validators is a simple function that takes the value to validate and possibly some additional key-value arguments. Each function returns True ...

formvalidation.io/validators

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

wtforms.readthedocs.io/en/latest/validators.html

NOTE this validator used to be called Required but the way it behaved (requiring coerced data, not input data) meant it functioned in a way which was not ...

angular.io/docs/ts/latest/api/forms/index/Validators-class.html

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.

commons.apache.org/validator

Feb 16, 2017 ... Commons Validator. A common issue when receiving data either electronically or from user input is verifying the integrity of the data. This work ...

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 ...

www.validators.nl/?lang=en

Validators doet onderzoek om communicatie beter te maken. Wij bieden een breed portfolio aan oplossingen die de communicatie van onze klanten verbetert.