如何在HTML表格中搜索我在搜索栏中输入的完全匹配？

I am currently using the code below to create a single-column search for an HTML table on a website. At the moment, when I type something in to the search bar, the code returns every row that has content that contains the thing I searched for anywhere within it. For example (I'm using this for movie ratings), when I type "G" in to the search bar, I get back everything rated G, but also everything rated PG or PG-13. Is there a way that I can adapt this code to return only results that are exact matches for my search? In other words, is there a way to change things so that when I search for "G" (or "g"), I only get back my G-rated movies and not anything rated PG or PG-13?I am currently using the code below to create a