In JavaScript, regex groups are utilized to represent numbers that are not represented as characters within a string. Through the regex method, we can establish a numerical range or individual numbers to extract the desired character. The test, search, and match methods do not contain specific numbers or symbols for the characters within the brackets, like [^9]. It is possible to utilize a group of numbers, for example, [^0-9].
Syntax
The syntax provided is utilized to create regex groups for numbers that are not available.
/[^0-9]/
/[^0-9]/modifier;
Explanation:
By employing the regex group, it is possible to make essential numbers inaccessible by utilizing a global modifier.
The regex group can be applied with or without a modifier, providing flexibility in its usage.
Examples
The illustrations below demonstrate the regex group [^0-9] or [^0] for identifying non-numeric characters within a string.
Example 1
An illustration demonstrating the utilization of a regex group for a basic number (^8) is presented below. In this scenario, a solitary number is employed alongside a global modifier.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp groups
</title>
<style>
#demo1 {
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id="demo1">
<h3>
JavaScript RegExp groups for numbers
</h3>
<h4> In the regex group test, the 8 number does not act as a character
</h4>
<div id="regex_group"></div>
<!-- click the button to operate regex number group -->
<button onclick="display_num();"> Click Here! </button>
</div>
<script>
function display_num() {
// use regex number group for number with global modifier
let input_pattern = /[^8]/g;
var group_t1 = input_pattern.test('99884532');
var group_t2 = input_pattern.test('dfb003sbbff');
var group_t3 = input_pattern.test('jf8838g');
//Output shows the availability of the regex value in the string
var ele = document.getElementById("regex_group");
ele.innerHTML = "99884532 : " + group_t1 + "<br> dfb003sbbff : " + group_t2 + " <br> jf888g : " + group_t3
}
</script>
</body>
</html>
Output
The result presents 8 numbers that are not present within the parentheses for the given string.
Example 2
The illustration below demonstrates the exclusion of the simple number group [^0-5] through the utilization of JavaScript regex. In this case, we specify numbers ranging from zero to five along with the modifier for numerical value.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp groups
</title>
<style>
#demo1 {
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id="demo1">
<h3>
JavaScript RegExp groups for numbers
</h3>
<h4> In the regex group test, the 0-5 number does not act as a character
</h4>
<div id="regex_group">
</div>
<!-- click the button to operate regex number group -->
<button onclick="display_num();"> Click Here! </button>
</div>
<script>
function display_num() {
// use regex number group for 0 to 5 numerical pattern
let input_pattern = /[^0-5]/g;
var group_t1 = input_pattern.test('99884532');
var group_t2 = input_pattern.test('dfb003sbbff');
var group_t3 = input_pattern.test('jf888g');
//Output shows the availability of the 0-5 number of group
var ele = document.getElementById("regex_group");
ele.innerHTML = "99884532 : " + group_t1 + "<br> dfb003sbbff : " + group_t2 + " <br> jf888g : " + group_t3
}
</script>
</body>
</html>
Output
The displayed Output indicates the range of numbers from 0 to 5 that are not available within the brackets for the specific string.
Example 3
In this instance, the given pattern is used to identify numbers outside the range specified within a string. The pattern [^0-5] is employed for this purpose.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp groups
</title>
<style>
#demo1 {
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id="demo1">
<h3>
JavaScript RegExp groups not for numbers
</h3>
<div id="regex_group">
</div>
<!-- click the button to operate regex number group -->
<button onclick="display_num();"> Click Here! </button>
</div>
<script>
function display_num() {
// use regex number group for a numerical pattern with a modifier
let input_pattern = /[0-5]/g;
var group_input1 = "99884532";
var group_input2 = "dfb003sbbff";
var group_input3 = "998877";
var group_t1 = group_input1.match(input_pattern);
var group_t2 = group_input2.match(input_pattern);
var group_t3 = group_input3.match(input_pattern);
//Output shows the array value of the regex group pattern
var ele = document.getElementById("regex_group");
ele.innerHTML = "99884532 : " + group_t1 + "<br> dfb003sbbff : " + group_t2 + " <br> 998877 : " + group_t3
}
</script>
</body>
</html>
Output
The result displayed in the bracket indicates the numbers between 0 and 5 that are not available in the string.
Example 4
In the illustration below, a search is conducted within a specified set of numbers to determine the position of a particular number. This search operation indicates whether the number is present within the collection.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp groups
</title>
<style>
#demo1 {
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id="demo1">
<h3>
JavaScript RegExp groups not for numbers
</h3>
<h4> The regex group searches the not in [0-5] numbers as a character
</h4>
<div id="regex_group"></div>
<!-- click the button to operate regex number group -->
<button onclick="display_num();"> Click Here! </button>
</div>
<script>
function display_num() {
// use regex number group for numerical pattern
let input_pattern = /[^0-5]/g;
var group_input1 = "99884532";
var group_input2 = "dfb003sbbff";
var group_input3 = "998877";
var group_t1 = group_input1.search(input_pattern);
var group_t2 = group_input2.search(input_pattern);
var group_t3 = group_input3.search(input_pattern);
//Output shows the position of the pattern value in the string
var ele = document.getElementById("regex_group");
ele.innerHTML = "99884532 : " + group_t1 + "<br> dfb003sbbff : " + group_t2 + " <br> 998877 : " + group_t3
}
</script>
</body>
</html>
Output
The output indicates that the number is not available.
Example 5
An illustration below demonstrates the absence of a particular group's value. It employs the match function to locate the group (^123) within a string. The regular expression extracts the first, second, and third digits from the input string.
<html>
<head>
<title>
JavaScript RegExp groups
</title>
<style>
#demo1 {
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id="demo1">
<h3>
JavaScript RegExp groups for numbers
</h3>
<div id="regex_group"></div>
<!-- click the button to operate regex number group -->
<button onclick="display_num();"> Click Here! </button>
</div>
<script>
function display_num() {
//Use number regex pattern for a set of numbers
let input_pattern = /[^123]/g;
var group_input1 = "0199884532";
var group_input2 = "dfb003sbbff";
var group_input3 = "9298877";
var group_t1 = group_input1.match(input_pattern);
var group_t2 = group_input2.match(input_pattern);
var group_t3 = group_input3.match(input_pattern);
var ele = document.getElementById("regex_group");
//Output shows the matching value in the string
ele.innerHTML = "0199884532 : " + group_t1 + "<br> dfb003sbbff : " + group_t2 + " <br> 9298877 : " + group_t3
}
</script>
</body>
</html>
Output
The result displays a set of numbers within a string.
Conclusion
The regular expression for number groups is employed to verify numeric values by utilizing square brackets with numbers [0-9].
