<html><body><h1>JavaScript 正则表达式</h1><p>在字符串中搜索字符 "THIS"：</p><p id="demo"></p><script>let text = "THIS This this";let result1 = text.match(/[THIS]/g);let result2 = text.match(/[THIS]/gi);document.getElementById("demo").innerHTML =result1 + "<br>" +result2;</script></body></html>