Node.js正则表达式无效

Question

我正在尝试将this coffeescript转换为javascript代码并在node.js上运行。该代码块从Android设备解析logcat日志。

这是我的工作：

var fs = require('fs');
fs.readFile("logcat.log", 'utf8', function (err, data) {
    parse(data)
});
var PATTERNS = {
    brief: new RegExp("^(?<level>[VDIWEAF])\\/(?<tag>[^)]{0,23}?)\\(\\s*(?<pid>\\d+)\\):\\s+(?<message>.*)$"),
    threadtime: new RegExp("^(?<timestamp>\\d\\d-\\d\\d\\s\\d\\d:\\d\\d:\\d\\d\\.\\d+)\\s*(?<pid>\\d+)\\s*(?<tid>\\d+)\\s(?<level>[VDIWEAF])\\s(?<tag>.*?):\\s+(?<message>.*)$"),
    time: new RegExp("^(?<timestamp>\\d\\d-\\d\\d\\s\\d\\d:\\d\\d:\\d\\d\\.\\d+):*\\s(?<level>[VDIWEAF])\\/(?<tag>.*?)\\((?<pid>\\s*\\d+)\\):\\s+(?<message>.*)$"),
    process: new RegExp("^(?<level>[VDIWEAF])\\(\\s*(?<pid>\\d+)\\)\\s+(?<message>.*)$"),
    tag: new RegExp("^(?<level>[VDIWEAF])\\/(?<tag>[^)]{0,23}?):\\s+(?<message>.*)$"),
    thread: new RegExp("^(?<level>[VDIWEAF])\\(\\s*(?<pid>\\d+):(?<tid>0x.*?)\\)\\s+(?<message>.*)$"),
    ddms_save: new RegExp("^(?<timestamp>\\d\\d-\\d\\d\\s\\d\\d:\\d\\d:\\d\\d\\.\\d+):*\\s(?<level>VERBOSE|DEBUG|ERROR|WARN|INFO|ASSERT)\\/(?<tag>.*?)\\((?<pid>\\s*\\d+)\\):\\s+(?<message>.*)$")
}

var LEVELS = {
    V: "verbose",
    D: "debug",
    I: "info",
    W: "warn",
    E: "error",
    A: "assert",
    F: "fatal",
    S: "silent"
};

get_type = function (line) {
    PATTERNS.forEach(element => {
        if (element.test(line)) {
            return element.keys(a)[0];
        }
        return null;
    });
}

function parse(contents) {
    var type = null;
    var messages = [];
    var badlines = 0;
    contents.split("\n").forEach(line => {
        line = line.replace(/\s+$/g, "");
        if (!type) {
            type = get_type(line)
        }
        var regex = PATTERNS[type];

        if (type && line.length > 0) {
            try {
                match = regex.exec(line);
                if (match.includes('level')) {
                    message.level = match.level;
                }
                if (match.includes('timestamp')) {
                    message.timestamp = match.level;
                }



                messages.push(message);
            } catch (error) {
                badlines++;
            }
        }
    });
    return {
        type: type,
        messages: messages,
        badlines: badlines
    }
}

此正则表达式行出现错误：

^(?<level>[VDIWEAF])\\/(?<tag>[^)]{0,23}?)\\(\\s*(?<pid>\\d+)\\):\\s+(?<message>.*)$

错误消息是：

无效的正则表达式：/^(?[VDIWEAF])/(?[^)]{0,23}?)(\s*(?\d+)):\s+(?.*)$/：无效的组