LINKEDIN detection of User Agent in their main site.

gistfile1.js

YAHOO.env.ua = function() {
    var D = function(H) {
        var I = 0;
        return parseFloat(H.replace(/\./g, function() {
            return (I++ == 1) ? "" : ".";
        }));
    }, G = navigator,
        F = {
            ie: 0,
            opera: 0,
            gecko: 0,
            webkit: 0,
            mobile: null,
            air: 0,
            caja: G.cajaVersion,
            secure: false,
            os: null
        }, C = navigator && navigator.userAgent,
        E = window && window.location,
        B = E && E.href,
        A;
    F.secure = B && (B.toLowerCase().indexOf("https") === 0);
    if (C) {
        if ((/windows|win32/i).test(C)) {
            F.os = "windows";
        } else {
            if ((/macintosh/i).test(C)) {
                F.os = "macintosh";
            }
        } if ((/KHTML/).test(C)) {
            F.webkit = 1;
        }
        A = C.match(/AppleWebKit\/([^\s]*)/);
        if (A && A[1]) {
            F.webkit = D(A[1]);
            if (/ Mobile\//.test(C)) {
                F.mobile = "Apple";
            } else {
                A = C.match(/NokiaN[^\/]*/);
                if (A) {
                    F.mobile = A[0];
                }
            }
            A = C.match(/AdobeAIR\/([^\s]*)/);
            if (A) {
                F.air = A[0];
            }
        }
        if (!F.webkit) {
            A = C.match(/Opera[\s\/]([^\s]*)/);
            if (A && A[1]) {
                F.opera = D(A[1]);
                A = C.match(/Opera Mini[^;]*/);
                if (A) {
                    F.mobile = A[0];
                }
            } else {
                A = C.match(/MSIE\s([^;]*)/);
                if (A && A[1]) {
                    F.ie = D(A[1]);
                } else {
                    A = C.match(/Gecko\/([^\s]*)/);
                    if (A) {
                        F.gecko = 1;
                        A = C.match(/rv:([^\s\)]*)/);
                        if (A && A[1]) {
                            F.gecko = D(A[1]);
                        }
                    }
                }
            }
        }
    }
    return F;
}();