带命名捕获组的 JavaScript 正则表达式
借助 JavaScript,可以对正则表达式的一部分进行分组。这可以通过用括号括住字符来实现。
以下是一个示例 −
示例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <style> body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample,.result { font-size: 20px; font-weight: 500; } </style> </head> <body> <h1>Named capture groups Regular Expressions</h1> <div class="sample">The year in which i passed school was 2012.</div> <div style="color: green;" class="result"></div> <button class="btn">CLICK HERE</button> <h3> Click on the above button to extract the year using named groups </h3> <script> let sampleEle = document.querySelector(".sample").innerHTML; let btnEle = document.querySelector(".btn"); let resEle = document.querySelector(".result"); const yearRegex = /(?\d{4})/g; btnEle.addEventListener("click", () => { resEle.innerHTML = "The year = " + sampleEle.match(yearRegex); }); </script> </body> </html>
输出
上述代码将生成以下输出 −
单击“单击此处”按钮时 −
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