解釋 JavaScript 中正則表示式的“dotAll”標誌
dotAll 標誌會返回 true 或 false,具體取決於正則表示式中是否設定了 s 標誌。
以下是 JavaScript 中用於實現正則表示式 dotAll 標誌的程式碼 −
範例
<!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; } .result { font-size: 20px; font-weight: 500; } </style> </head> <body> <h1>dotAll flag for regular expressions</h1> <div style="color: green;" class="result"></div> <button class="btn">CLICK HERE</button> <h3> Click on the above button to know if s flag has been set in regex or not </h3> <script> let btnEle = document.querySelector(".btn"); let resEle = document.querySelector(".result"); const regex = new RegExp("Hello", "s"); btnEle.addEventListener("click", () => { resEle.innerHTML = "The s flag has been set : " + regex.dotAll; }); </script> </body> </html>
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