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Edit File: class.katakana.php

<?php
/**
 * @package mw-wp-form
 * @author websoudan
 * @license GPL-2.0+
 */

/**
 * MW_WP_Form_Validation_Rule_Katakana
 */
class MW_WP_Form_Validation_Rule_Katakana extends MW_WP_Form_Abstract_Validation_Rule {

/**
	 * Validation rule name.
	 *
	 * @var string
	 */
	protected $name = 'katakana';

/**
	 * Validation process.
	 *
	 * @param string $name    Validation name.
	 * @param array  $options Validation options.
	 * @return string
	 */
	public function rule( $name, array $options = array() ) {
		$value = $this->Data->get( $name );
		if ( MWF_Functions::is_empty( $value ) ) {
			return;
		}

if ( preg_match( '/^[ァ-ヾ 　]*?[ァ-ヾ]+?[ァ-ヾ 　]*?$/u', $value ) ) {
			return;
		}

$defaults = array(
			'message' => __( 'Please enter with a Japanese Katakana.', 'mw-wp-form' ),
		);
		$options  = array_merge( $defaults, $options );
		return $options['message'];
	}

/**
	 * Add setting field to validation rule setting panel.
	 *
	 * @param numeric $key ID of validation rule.
	 * @param array   $value Content of validation rule.
	 * @return void
	 */
	public function admin( $key, $value ) {
		?>
		<label><input type="checkbox" <?php checked( $value[ $this->get_name() ], 1 ); ?> name="<?php echo MWF_Config::NAME; ?>[validation][<?php echo $key; ?>][<?php echo esc_attr( $this->get_name() ); ?>]" value="1" /><?php esc_html_e( 'Japanese Katakana', 'mw-wp-form' ); ?></label>
		<?php
	}
}