source/core-developers/url-validator.md

---
layout: default
title: url validator
parent:
    title: Validation
    url: validation.html
---

# url validator
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* Will be replaced with the ToC, excluding a header
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## Description

URLValidator checks that a given field is a String and a valid URL.

## Parameters

- `fieldName` - The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required.
- `urlRegexExpression` - The regex defined as expression used to validate url. If not defined 'urlRegex' will be used instead.
- `urlRegex` - The regex used to validate url. If not defined default regex will be used.

## Examples

```xml
<validators>
    <!-- Plain Validator Syntax -->
    <validator type="url">
        <param name="fieldName">myHomePage</param>
        <message>Invalid homepage url</message>
    </validator>

    <!-- Field Validator Syntax -->
    <field name="myHomepage">
        <field-validator type="url">
            <message>Invalid homepage url</message>
        </field-validator>
    </field>
</validators>
```

See more details in [UrlValidator Annotation](url-validator-annotation)