<html><body><h1>JavaScript 正则表达式</h1><p>全局搜索字符串中的字符 "i" 和 "s" ：</p><p id="demo"></p><script>let text = "Do you know if this is all there is?";let pattern = /[is]/gi; let result = text.match(pattern);document.getElementById("demo").innerHTML = result;</script></body></html>