Javascript array custom functions

array.js

/*
* Returns an array that contains the indexes from a search that match the array values with the given regular expression
* @param  str Regular expresion
* return Array of indexes (integers), -1 if no value matches the regexp
*/
Array.prototype.allIndexOfStr = function (str) {
    var pos = [];
    for (var j=0; j<this.length; j++) {
        if (this[j].match(str))
            pos.push(j);
    }
    return pos.length > 0 ? pos : -1;
}

/*
* Remove position(s) from an array
* @param  array/integer List of indexes/index to remove
* return original array with removed positions
*/
Array.prototype.remove = function(ind){
    if(ind.constructor === Array){
        var n = ind.length;
        for(var i = 0; i < n ; i++){
            this.splice(ind[i]-i,1);
        }
    }else{
        this.splice(ind,1);
    }
    return this;
};