JSFiddle - React, Tailwind, and code Playground

JavaScript

var patt = /<\s*h2[^>]+>([^<]+)<\/h2\s*>/;

var result1 = patt.exec('<h2 class="a-text-normal">匹配我！</h2>');
alert(result1[1]);

var result2 = patt.exec('<h2 class="a-text-normal">test content</h2>');
alert(result2[1]);