命名捕获组 JavaScript 正则表达式

javascriptweb developmentobject oriented programming

使用 JavaScript，您可以对正则表达式的一部分进行分组。这可以通过将字符封装在括号中来实现。

以下是示例 −

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">点击此处</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>