• 코드:
​x
 
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<!DOCTYPE html>
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<html lang="ko">
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​
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<head>
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    <meta charset="UTF-8">
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    <title>JavaScript Regular Expression</title>
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</head>
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​
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<body>
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​
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    <h1>정규 표현식의 괄호</h1>
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    <p id="text"></p>
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​
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    <script>
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        var targetStr = "abc 123 abc 123";
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        var oneReg = /(\w+) (\d+)/;             // abc 123, abc, 123
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        var anotherReg = /(\w+) (\d+) \1 \2/;   // abc 123 abc 123, abc, 123
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        document.getElementById("text").innerHTML =
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            targetStr.match(oneReg) + "<br>" + targetStr.match(anotherReg);
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    </script>
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</body>
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​
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</html>