# Validation Validating fields (text or other) is crucial for ensuring that data entered by users meets specific criteria or formats and for maintaining data integrity and security. In Jigx Builder you can use regular expressions (regex) for text validation. They allow for pattern matching and can enforce complex rules for text fields such as email addresses, phone numbers, usernames, passwords, and more. When applied to text validation, regex can be used to check if the input text matches the desired format. If it is not valid, an invalid message is displayed. In Jigx you combine a [JSONata expression](https://docs.jigx.com/building-apps-with-jigx/logic/expressions) with a [Regex expressions](https://docs.jigx.com/examples/readme/expressions/regex-expressions) to create a validation pattern and provide a message if the pattern does not match. ## Creating the validation expression:

1. JSONata expression - `=@ctx.components.email.state.value` 2. Regex expression - `/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/` 3. Validation message - `not an email` Combine the three above to validate an email address in the `text-field` component. {% code title="YAML" %} ```yaml - type: component.text-field instanceId: email options: label: Email errorText: =$contains(@ctx.components.email.state.value, /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/) ? '' :'not an email' ``` {% endcode %} ## Regex and JSONata Expression examples Here are some common validation expressions to create and use for text field validation.

Validation	Expected result
Phone number	+271234556789
Email	name@example.com
Credit Card	Typically 13-16 digits, with spaces or dashes optional, and includes checks for Visa, MasterCard, American Express, and Discover. 1111-1111-1111-1111 or 1111 1111 1111 1111
ZIP/Postal code (US)	5-digit codes, e.g. 10036
Social Security Number (US)	XXX-XX-XXXX
National Insurance (UK)	AA123456C
US Date (DD/MM/YYYY)	23/07/2024
Date (MM/DD/YYYY)	03/28/2023
Date (DD Month YYYY)	25 July 2024
Date (yyyy/mm/dd)	2024/08/30
Decimal	111,25
Time (H:MM AM/PM)	12:15 AM or 08:45 PM
Date (MM:SS or HH:MM)	08:10
Time in 24-hour format	01:00
URL	example.com or https://example.com
ISBN	978-1-4302-1998-9
Strict alpha numeric	JohnSmith
Alpha numeric with spaces	John Smith
Numbers and spaces only	56575 76 6

## See Also * [Regex expressions](https://docs.jigx.com/examples/readme/expressions/regex-expressions) * [Expressions](https://docs.jigx.com/building-apps-with-jigx/logic/expressions) * [Expressions - cheatsheet](https://docs.jigx.com/building-apps-with-jigx/logic/expressions/expressions-cheatsheet) * [Expression-examples](https://docs.jigx.com/examples/readme/expressions) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.jigx.com/building-apps-with-jigx/logic/validation.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.