r.js

function x() {
    var patterns = [];
    for (var i = 0; i < 9; i++) {
        for (var i2 = 0; i2 < 9; i2++) {
            patterns.push(
                '(?:' + i2 + '<=?' + '['+(i2+1)+'-9](?:\\.\\d*)?|' + i2 + '>=?(?:[0-' + Math.max(i2-1, 0) + '])(?:\\.\\d*)?)'
            );
        }
        patterns.push('(?:'+ i +'[><]='+ i +')');
        patterns.push('(?:' + i + '<[1-9]\\d+(?:\\.\\d*)?|' + i + '>-\\d(?:\\.\\d*)?)');
    }
    return patterns.join('|');
}
var r = new RegExp('(?:' + x() + ')\\s*&&\\s*(?:' + x() + ')')