vdbkw

/**
 * NL mobile phone validation
 Landline: (((0)[1-9]{2}[0-9][-]?[1-9][0-9]{5})|((\\+31|0|0031)[1-9][0-9][-]?[1-9][0-9]{6}))$
 Mobile: (((\\+31|0|0031)6){1}[1-9]{1}[0-9]{7})$
 set css class phone field to: mobiel
 */
 
add_filter( 'gform_field_validation', 'validate_phone', 10, 4 );

function validate_phone( $result, $value, $form, $field ) {