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Edit File: ColorFormatRule.php

<?php namespace WPDesk\FCF\Free\Validator\Rule; use WPDesk\FCF\Free\Validator\Error\InvalidValueError; /** * Checks that the color value is valid. */ class ColorFormatRule implements ValidatorRule { /** * {@inheritdoc} */ public function validate_value( string $value, array $field_data ) { if ( ( $value === '' ) || preg_match( '/^#[a-zA-Z0-9]{6}$/', $value ) ) { return null; } return new InvalidValueError( $field_data, $value ); } }