现场演示：我的 HTML 文档

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JavaScript Match a Pattern in a Multiline String Using Regular Expression</title>
</head>
<body>
    <script>    
    var str = "Color red is more visible than \ncolor blue in daylight.";
    var regex1 = /^color/gi;
    var regex2 = /^color/gim;
    
    var matches = str.match(regex1); // pattern matching without multiline flag    
    document.write("<p>Found " + matches.length + " matches: " + matches + "</p>");
    console.log(matches);
    
    matches = str.match(regex2); // pattern matching with multiline flag
    document.write("<p>Found " + matches.length + " matches: " + matches + "</p>");
    console.log(matches);
    </script>
</body>
</html>