grep over your js arrays

grep.js

var grep = function(pattern, invert) {
    invert = invert || false
    var ret = [];
    if(this.filter) {
        ret = this.filter(function(element) {
            var b = element.match(pattern);
            return b && !invert || invert && !b;
        });
    } else {
        for(var n in this) {
            var element = this[n];
            if(element.match && typeof element.match == 'function') {
                var b = element.match(pattern);
                if(b && !invert || invert && !b) {
                    ret.push(element);
                }  
            }  
        }  
    }  
    return ret;
}

usage.js

var myarray = [..some data..];

// make grep a member of myarray
myarray.grep = grep;
// normal grep
var filterd = myarray.grep(/regexp/);

// invert match (-v option by grep)
var invert = myarray.grep(/regexp/, true);

// you can use grep.apply if u don't want to mess around in your objects
var filtered = grep.apply(myarray, [/regexp/, true]);