https://www.cestovani-po-usa.cz/wp-content/plugins/webba-booking-lite/public/js/wbk-validator.js?ver=5.1.25

1// WEBBA Booking js validation functions
2
3// check integer
4function wbkCheckInteger(val) {
5    return /^\+?(0|[1-9]\d*)$/.test(val);
6}
7// check integer
8function wbkCheckFloat(val) {
9    return /^(?:[1-9]\d*|0)?(?:\.\d+)?$/.test(val);
10}
11
12// check string
13function wbk_check_string(val, min, max) {
14    if( val == null ){
15        return false;
16    }
17    if (val.length < min || val.length > max) {
18        return false;
19    } else {
20        return true;
21    }
22}
23// check email
24function wbk_check_email(val) {
25    var re =
26        /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
27    if (val == '' || !re.test(val)) {
28        return false;
29    }
30    return true;
31}
32// check interger range
33function wbk_check_integer_min_max(val, min, max) {
34    val = parseInt(val);
35    min = parseInt(min);
36    max = parseInt(max);
37
38    if (val < min || val > max) {
39        return false;
40    } else {
41        return true;
42    }
43}
44
45// check phone
46function wbkCheckPhone(val) {
47    var pattern = new RegExp(
48        /^[(]{0,1}[0-9]{3}[)]{0,1}[-\s\.]{0,1}[0-9]{3}[-\s\.]{0,1}[0-9]{4}$/
49    );
50    return pattern.test(val);
51}
52// check price
53function wbkCheckPrice(val) {
54    if (val == '') {
55        return false;
56    }
57    if (wbkCheckInteger(val)) {
58        if (wbk_check_integer_min_max(val, 0, 9999999)) {
59            return true;
60        }
61    }
62    if (wbkCheckFloat(val)) {
63        if (val >= 0 || val <= 9999999) {
64            return true;
65        }
66    }
67    return false;
68}