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<!DOCTYPE html> <html> <body> <p>单击该按钮可在字符串中以不区分大小写的方式搜索“begtut”。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var str = "Visit BEGTUT"; var patt1 = /begtut/i; var result = str.match(patt1); document.getElementById("demo").innerHTML = result; } </script> </body> </html>