Message filter hooks

cf7-hooks.php

add_filter( 'wpcf7_validate_text*', 'custom_phone_confirmation_validation_filter', 20, 2 );
function custom_phone_confirmation_validation_filter( $result, $tag ) {
  if ( 'your-phone' == $tag->name ) {  
    $your_phone = isset( $_POST['your-phone'] ) ? trim( $_POST['your-phone'] ) : '';
	if ( !preg_match('/^0/', $your_phone ) ){
		$result->invalidate( $tag, "Needs to start with a zero, are you a bot?" );
	}
  }
  return $result;
}

add_filter( 'wpcf7_validate_textarea*', 'textarea_confirmation_validation_filter', 20, 2 );
function textarea_confirmation_validation_filter( $result, $tag ) {
  if ( 'your-message' == $tag->name ) {  
    $your_message = isset( $_POST['your-message'] ) ? trim( $_POST['your-message'] ) : '';	
	if ( preg_match('/google|seo|http|latex|gloves/i', $your_message ) ){
		$result->invalidate( $tag, "Your message contains invalid words that are not allowed, we are trying to weed out spam bots, please rephrase. No links etc." );
	}
	
  }
  return $result;
}