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Hexo script to get words count of a post contents

/**
 * Get the word count of a paragraph.
 */
hexo.extend.helper.register('word_count', (content) => {
    content = content.replace(/<\/?[a-z][^>]*>/gi, '');
    content = content.trim();
    return content ? (content.match(/[\u00ff-\uffff]|[a-zA-Z]+/g) || []).length : 0;
});