https://materolbia.com/wp-content/plugins/webba-booking/common/wbk-validator.js?ver=6.8.3

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 wbkCheckString( val, min, max ) {
14    if ( val.length < min || val.length > max ) {
15		return false;
16	} else {
17		return true;
18	}
19}
20// check email
21function wbkCheckEmail( val ) {
22var re = /^(([^<>()\[\]\\.,;:\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,}))$/;
23if ( val == '' || !re.test(val) ){
24    return false;
25}
26return true;
27
28}
29// check interger range
30function wbkCheckIntegerMinMax( val, min, max ) {
31	val = parseInt( val );
32	min = parseInt( min );
33	max = parseInt( max );
34
35    if ( val < min || val > max ) {
36		return false;
37	} else {
38		return true;
39	}
40}
41// check phone
42function wbkCheckPhone( val ) {
43	var pattern = new RegExp(/^[(]{0,1}[0-9]{3}[)]{0,1}[-\s\.]{0,1}[0-9]{3}[-\s\.]{0,1}[0-9]{4}$/);
44	return pattern.test(val);
45}
46// check price
47function wbkCheckPrice( val ) {
48	if(  val == '' ){
49		return false;
50	}
51	if( wbkCheckInteger( val ) ){
52		if ( wbkCheckIntegerMinMax( val, 0, 9999999 ) ){
53			return true;
54		}
55	}
56	if( wbkCheckFloat( val ) ){
57		if ( val >= 0 || val <= 9999999 ) {
58			return true;
59		}
60	}
61	return false;
62}