The compile method in JavaScript Regex assists in returning the result of the function following the compilation of the regex. It is useful for obtaining messages subsequent to processing the JavaScript regex pattern.
Syntax
The syntax below is utilized for retrieving compile-time errors or messages.
regexObject.compile("Regexp", "modifier");
Supported Browsers
The browsers supported by the Regex compile method are given below:
- Google Chrome
- Edge
- Firefox
- Internet Explorer
- Opera
- Safari
Examples
Below are various instances demonstrating the diverse regex pattern types for utilizing the compile method in JavaScript.
Example 1:
In this instance, the sample demonstrates the utilization of the match function in conjunction with the regex compile method for performing validations.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp compile method
</title>
<style>
#demo1 {
background-color: aqua;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h3>
JavaScript RegExp compile method
</h3>
<h4> The compile method gets the message of the regular expression structure </h4>
<!-- Click the button to get the ignoreCase properties output -->
<div id = "regex_group"></div>
<!-- Click the button to get quantifier output -->
<button onclick = "display_group();"> Click Here! </button>
</div>
<script>
function display_group() {
//Use required regular expression
let input_pattern = /i+/g;
var quant_input1 = "I learn javascript language from the website.";
var quant_alter1 = quant_input1.match(input_pattern);
//Get an error or regex message while compiling regex code
var comp_var = input_pattern.compile(input_pattern);
//output shows all available "i/I" values
var ele = document.getElementById("regex_group");
ele.innerHTML = "Compiling Regex: " +comp_var+ " Available Values: " + quant_alter1;
}
</script>
</body>
</html>
Output
The output displays both the compilation message and the regular expression output.
Example 2:
The provided illustration demonstrates the utilization of regular expression compile method for performing match searches in validations.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp compile method
</title>
<style>
#demo1 {
background-color: aqua;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h3>
JavaScript RegExp compile method
</h3>
<h4> The compile method gets the message of the regular expression structure </h4>
<!-- Click the button to get the ignoreCase properties output -->
<div id = "regex_group"></div>
<!-- Click the button to get quantifier output -->
<button onclick = "display_group();"> Click Here! </button>
</div>
<script>
function display_group() {
//Use required regular expression
let input_pattern = /t+/gi;
var quant_input1 = "The learn javascript language from the website.";
var quant_alter1 = quant_input1.search(input_pattern);
//Get an error or regex message while compiling regex code
var comp_var = input_pattern.compile(input_pattern);
//output shows all available "i/I" values
var ele = document.getElementById("regex_group");
ele.innerHTML = "compile message of the regex: " +comp_var + " <br> Available Values: " + quant_alter1;
}
</script>
</body>
</html>
Output
The output displays both the compilation message and the regular expression output.
Example 3:
In this scenario, the illustration demonstrates the utilization of the replace method alongside the regex compile method for validation purposes.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp compile method
</title>
<style>
#demo1 {
background-color: aqua;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h3>
JavaScript RegExp compile method
</h3>
<h4> The compile method gets the message of the regular expression structure </h4>
<!-- Click the button to get the ignoreCase properties output -->
<div id = "regex_group"></div>
<div id = "regex_group1"></div>
<!-- Click the button to get quantifier output -->
<button onclick = "display_group();"> Click Here! </button>
</div>
<script>
function display_group() {
//Use required regular expression
let input_pattern = /jtp/gi;
var quant_input1 = "The learn javascript language from the jtp website.";
//Get an error or regex message while compiling regex code
var comp_var = input_pattern.compile(input_pattern);
var quant_alter1 = quant_input1.replace(input_pattern, "JavaTpiont");
//output shows all available "i/I" values
var ele = document.getElementById("regex_group");
ele.innerHTML = "compile message of the regex: " +comp_var + " <br> before compile: " + quant_input1 ;
var ele1 = document.getElementById("regex_group1");
ele1.innerHTML = " After compile: " + quant_alter1 ;
}
</script>
</body>
</html>
Output
The result displays both the compilation message and the output of the regular expression.
Example 4:
The compile function in JavaScript interacts with the test method to process input and generates output through the compile method.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp compile method
</title>
<style>
#demo1 {
background-color: aqua;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h3>
JavaScript RegExp compile method
</h3>
<h4> The compile method gets the message of the regular expression structure </h4>
<!-- Click the button to get the ignoreCase properties output -->
<div id = "regex_group"></div>
<!-- Click the button to get quantifier output -->
<button onclick = "display_group();"> Click Here! </button>
</div>
<script>
function display_group() {
//Use required regular expression
let input_pattern = new RegExp("e", "gi");
var quant_input1 = "The learn javascript language from the website.";
//Get regex message while compiling regex code
var comp_var = input_pattern.compile(input_pattern);
var quant_alter1 = input_pattern.test(quant_input1);
//output shows all available "i/I" values
var ele = document.getElementById("regex_group");
ele.innerHTML = "compile message of the regex: " +comp_var + " <br> Available Values: " + quant_alter1;
}
</script>
</body>
</html>
Output
The output displays the compilation message along with the regular expression output.
Example 5:
The compile method in JavaScript operates with various regular expression patterns.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp compile method
</title>
<style>
#demo1 {
background-color: aqua;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h3>
JavaScript RegExp compile method
</h3>
<!-- Click the button to get the ignoreCase properties output -->
<div id = "regex_group"></div>
<!-- Click the button to get quantifier output -->
<button onclick = "display_group();"> Click Here! </button>
</div>
<script>
function display_group() {
//Use the required regular expression with the method
let input_pattern = new RegExp("^l");
var quant_input1 = "The learn javascript language";
//Get regex message while compiling regex code
var comp_var = input_pattern.compile(input_pattern);
var quant_alter1 = input_pattern.test(quant_input1);
// Output shows in boolean format
var ele = document.getElementById("regex_group");
ele.innerHTML = "compile message of the regex: " +comp_var + " <br> Available Values: " + quant_alter1;
}
</script>
</body>
</html>
Output
The result displays both the compilation message and the regular expression output.
Conclusion
The compile method in JavaScript for regular expressions is versatile, as it can be used with various types of regex patterns to obtain both the regex error and function. This feature simplifies the process for developers who need to work with numerous regex patterns and their associated functions, especially when handling large volumes of data.