gp-pay-per-word-ignore-words-between-parentheses.js

/**
 * Gravity Perks // Pay Per Word // Ignore Words Between Parentheses (JS)
 * https://gravitywiz.com/documentation/gravity-forms-pay-per-word/
 */
gform.addFilter( 'gpppw_word_count', function( wordCount, text, gwppw, ppwField, formId ) {
	// Removes words between parentheses.
	var words = text.replace( /\(([^)]+)\)/g, '' ).match( /\S+/g );
	return words == null ? 0 : words.length;
} );

gp-pay-per-word-ignore-words-between-parentheses.php

<?php
/**
 * Gravity Perks // Pay Per Word // Ignore Words Between Parentheses (PHP)
 * https://gravitywiz.com/documentation/gravity-forms-pay-per-word/
 */
add_filter( 'gpppw_word_count', function( $word_count, $words ) {
	// Removes words between parentheses.
	$words = preg_replace( '/\(([^)]+)\)/', ' ', $words );
	return count( array_filter( preg_split( '/[ \n\r]+/', trim( $words ) ) ) );
}, 10, 2 );