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<!DOCTYPE html> <html> <body> <p>单击按钮以全局搜索“is”，然后搜索“all”。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var str = "Is this all there is"; var patt1 = /is(?= all)/; var result = str.match(patt1); document.getElementById("demo").innerHTML = result; } </script> </body> </html>