Validate floats and ints in JavaScript

validate.js

//Removes all dots after the first one.
function removeExtraDots(str) {
    return str.replace( /^([^.]*\.)(.*)$/, function ( a, b, c ) {
        return b + c.replace( /\./g, '' );
    });
}

function dotsCount(number) {
    return (number.match(/[.]/g) || []).length;
}

//Checks if pattern matches float
function matchFloat(number) {
    var match = /^[0-9.]+$/.test(number);
    if(match && (dotsCount(number) <= 1)) {
        return true;
    }
    return false;
}

//Numbers and dots only
function ensureFloat(selector) {
    var number = selector.val();
    if(!matchFloat(number)) {
        number = number.replace(/[^0-9.]/g, "");
        if(dotsCount(number) > 1) {
            number = removeExtraDots(number);
        }
        selector.val(number);
    }
}

function matchInt(number) {
    var match = /^[0-9]+$/.test(number);
    if(match) {
        return true;
    }
    return false;
}

//Only numbers
function ensureInt(selector) {
    var number = selector.val();
    if(!matchInt(number)) {
        number = number.replace(/[^0-9]/g, "");
        selector.val(number);
    }
}