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<!DOCTYPE html> <html> <body> <h2>JavaScript 正则表达式</h2> <p>在字符串中搜索“BEGTUT”，并显示匹配的位置：</p> <p id="demo"></p> <script> var str = "Visit BEGTUT!"; var n = str.search(/BEGTUT/i); document.getElementById("demo").innerHTML = n; </script> </body> </html>