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<!DOCTYPE html> <html> <body> <p>单击该按钮可在字符串中每行的开头对“is”进行多行搜索。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var str = "\nIs th\nis it?"; var patt1 = /^is/m; var result = str.match(patt1); document.getElementById("demo").innerHTML = result; } </script> </body> </html>