仅从userAgent中提取浏览器名称？

Question

I'm presenting a message (implemented with javascript) for users that goes along the lines of

Your browser is too old to view my page. You are currently running:

followed by the name of the user's browser.

Unfortunately the navigator.userAgent usually looks like this:

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)

The only bit of that that I need to spit back is MSIE 8.0 .

Is there a regex somewhere out there that will more or less give me a sane, dumb-person friendly sanitization of the userAgent string? That works for a high percentage of browsers out in the wild.

Answer 1

To get browser name and version from userAgent, you could do:

function identifyBrowser() {
    var regexps = {
            'Chrome': [ /Chrome\/(\S+)/ ],
            'Firefox': [ /Firefox\/(\S+)/ ],
            'MSIE': [ /MSIE (\S+);/ ],
            'Opera': [
                /Opera\/.*?Version\/(\S+)/,
                /Opera\/(\S+)/
            ],
            'Safari': [ /Version\/(\S+).*?Safari\// ]
        },
        re, m, browser, version;

    userAgent = navigator.userAgent;
    elements = 2;
    for (browser in regexps)
        while (re = regexps[browser].shift())
            if (m = userAgent.match(re)) {
                version = (m[1].match(new RegExp('[^.]+(?:\.[^.]+){0,' + --elements + '}')))[0];
                return browser + ' ' + version);
            }
}