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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 正则表达式</h1>
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<p>对字符串中的 "is" 进行全局、不区分大小写的搜索：</p>
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<p id="demo"></p>
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<script>
let text = "Is this all there is?";
let result = /is/gi.test(text);
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document.getElementById("demo").innerHTML = result;
</script>
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</body>
</html>
​