Hides the Ninja Forms add-ons' prices in the cart and checkout pages

functions.php

/**
 * Hides the Ninja Forms add-ons' prices in the cart and checkout pages
 *
 * @param  string $text
 * @return string
 */
function wc_nf_hide_price( $text ) {
    $text    = strip_tags( $text ); // Strip HTML tags <span class="amount"></span>
    $pattern ='/\s\([\D]+([\d]+[.?][\d]+)\)/';

    /**
     * Pattern explained
     *
     * $pattern  = '/\s';              // Any white space/tab before the price
     * $pattern .= '\(';               // The price parenthesis
     * $pattern .= '[\D]+';            // Currency sign
     * $pattern .= '([\d]+[.?][\d]+)'; // Decimal amount
     * $pattern .= '\)/';              // The price parenthesis
     */

    return preg_replace( $pattern, '', $text );
}
add_filter( 'wc_nf_addons_cart_option', 'wc_nf_hide_price' );