<html><body><h1>JavaScript 正则表达式</h1><p>在字符串中全局搜索 "Hello" 和 "W3School"：</p><p id="demo"></p><script>let text = "Hello world!";// look for "Hello"let pattern1 = /Hello/g;let result1 = pattern1.test(text) // look for "W3School"let pattern2 = /W3School/g;let result2 = pattern2.test(text);document.getElementById("demo").innerHTML = result1 + "<br>" + result2;</script></body></html>