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<!DOCTYPE html> <html> <body> <h1>JavaScript 正则表达式</h1> <p>如果找到匹配项，则 test() 方法返回 true，否则返回 false。</p> <p>在字符串中搜索字符 "e"：</p> <p id="demo"></p> <script> let text = "The best things in life are free"; let pattern = /e/; let result = pattern.test(text); document.getElementById("demo").innerHTML = result; </script> </body> </html>