The modifier in JavaScript regex is responsible for managing and manipulating input data using metacharacters and various regular expressions. It collaborates with metacharacters and quantifiers to target specific fields. JavaScript's search, match, test, and exec methods interact with the regex modifier. These three modifiers are utilized in conjunction with the JavaScript regex method. Users have the ability to establish global sentences, case-insensitive parameters, and other quantifiers across multiple lines.
Types of Regex Modifiers
Three modifiers are operating in the regex using the javascript method. This modifier is used to operate regex information with the input string.
- The g modifier: the modifier matches and searches the global input information.
- The i modifier: the modifier matches and searches the case-insensitive characters of the input information.
- The m modifier: multiline match the modifier matches, searches the multi-lines characters of the input information.
Js g (global) Modifier
The global modifier is utilized to search for the necessary regular expression in global content. It is possible to combine the global modifier with other modifiers within the regular expression pattern.
Syntax:
A global modifier is applied to the regular expression when using it with the input string in the syntax.
/regexp/g
Explanation
The g flag is not required for the regular expression pattern but is essential for the complete string matching.
Examples
The provided examples demonstrate testing and matching with and without global modifiers.
Example 1:
The provided instance demonstrates the implementation of the fundamental global modifier, showcasing its functionality.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp g modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2>JavaScript Regular Expressions with g modifier </h2>
<p> The modifiers help to search a global for "java" in a string:</p>
<p id = "demo"></p>
</div>
<script>
let text_input = "Example website : the Javascript works to operate javascript methods";
//use regex global modifier with the match method
let pattern_global = /java/g;
let result_global = text_input.match(pattern_global);
//output shows available values
document.getElementById("demo").innerHTML = result_global;
</script>
</body>
</html>
Output
The result displays the regular expression symbols that are present in the input data.
Example 2:
The provided instance demonstrates the utilization of the fundamental global flag. By observing the comparison, we can distinguish the impact of including or excluding global modifiers.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp g modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with g modifier </h2>
<p> difference between with or without g modifier </p>
<p id = "demo_global"> </p>
<p id = "demo_globals"> </p>
</div>
<script>
//use regex global modifier with the match method
let text_input = "Example website : the Javascript works to operate javascript methods";
let pattern_global = /java/g;
let result_global = text_input.match(pattern_global);
document.getElementById("demo_global").innerHTML = result_global;
//use regex pattern without global modifier
let pattern_global1 = /java/;
let result_global1 = text_input.match(pattern_global1);
document.getElementById("demo_globals").innerHTML = result_global1;
</script>
</body>
</html>
Output
The result displays a worldwide regular expression modifier symbol within the input data.
Example 3:
An illustration below demonstrates simple global modifiers testing. The method being tested indicates the presence of the regular expression value.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp g modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with g modifier </h2>
<p> difference between with or without g modifier </p>
<p id = "demo_global"> </p>
</div>
<script>
let text_input = "Example website : the Javascript works to operate javascript methods";
//use regex global modifier with the test method
let pattern_global = /java/g;
let result_global = pattern_global.test(text_input);
document.getElementById("demo_global").innerHTML = result_global;
</script>
</body>
</html>
Output
The result demonstrates the presence of a global regular expression modifier character within the input data.
Example 4:
In this instance, a global keyword is employed alongside the global modifier.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp g modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with g modifier </h2>
<p id = "demo_global"> </p>
</div>
<script>
let text_input = "Example website : the Javascript works to operate javascript methods";
//use regex global modifier with the global keyword
let pattern_global = /java/g;
let result_global = pattern_global.global;
document.getElementById("demo_global").innerHTML = result_global;
</script>
</body>
</html>
Output:
The result demonstrates the presence of the global regular expression modifier.
Js i Modifier
The modifier in question is responsible for conducting a case-insensitive search for the specified regular expression. Typically, this modifier is utilized in conjunction with the global and multiline modifiers.
Syntax:
The syntax employs a modifier that ignores case sensitivity when applying the regular expression to the input string.
/regexp/i
Explanation:
- The i flag is not mandatory for regular expressions but is crucial when dealing with case-insensitive strings.
Examples
The examples provided demonstrate testing or matching with and without case-sensitive modifiers.
Example 1:
In the provided instance, the basic case-sensitive modifier is being demonstrated. It showcases how the case-sensitive modifier functions.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp i modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with i modifier </h2>
<p> The modifiers help to search a case-insensitive for "java" in a string: </p>
<p id = "demo_case"> </p>
<p id = "demo_case1"> </p>
</div>
<script>
let text_input = "Example website : the Javascript works to operate javascript methods";
//use regex global and case-insensitive modifiers
let pattern_case = /java/gi;
let result_case = text_input.match(pattern_case);
//output shows the available value in the string
document.getElementById("demo_case").innerHTML = result_case;
</script>
</body>
</html>
Output
The output displays the regular expression characters that are present in the input data.
Example 2:
In this instance, the basic case-insensitive modifier is demonstrated. Contrasting results are evident when comparing the presence or absence of case-sensitive modifiers.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp i modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with i modifier </h2>
<p> difference between with or without i modifier </p>
<p id = "demo_case"> </p>
<p id = "demo_case1"> </p>
</div>
<script>
let text_input = "Example website : the Javascript works to operate javascript methods";
//use regex global and case-insensitive modifiers
let pattern_case = /java/gi;
let result_case = text_input.match(pattern_case);
document.getElementById("demo_case").innerHTML = result_case;
let pattern_case1 = /java/g;
let result_case1 = text_input.match(pattern_case1);
document.getElementById("demo_case1").innerHTML = result_case1;
</script>
</body>
</html>
Output
The output displays the regular expression characters that are present in the input data.
Example 3:
In this instance, we are examining a crucial scenario involving the case-insensitive modifier. We are employing both global and case-insensitive modifiers concurrently through regular expressions.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp i modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with i modifier </h2>
<p> The modifiers help to search a case-insensitive for "java" in a string:</p>
<p id = "demo_global"> </p>
</div>
<script>
let text_input = "Example website : the Javascript works to operate Javascript methods";
//use regex global and case-insensitive modifiers
let pattern_global = /java/gi;
let result_global = pattern_global.test(text_input);
document.getElementById("demo_global").innerHTML = result_global;
</script>
</body>
</html>
Output
The output displays the regular expression characters that are present in the input data.
Example 4:
The provided demonstration examines a fundamental scenario involving a case-insensitive modifier.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp i modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with i modifier </h2>
<p> The modifiers help to filter a case-insensitive for "java" in a string:</p>
<p id = "demo_global"> </p>
</div>
<script>
let text_input = "Example website : the Javascript works to operate Javascript methods";
//use regex global and case-insensitive modifiers
let pattern_global = /java/gi;
let result_global = pattern_global.exec(text_input);
document.getElementById("demo_global").innerHTML = result_global;
</script>
</body>
</html>
Output
The result displays the regular expression characters that are present in the input data.
Js m Modifier
The multi-line modifier is utilized to search through multi-line data for specific regular expressions. It is possible to combine the multi-line modifier with other modifiers by employing a regex pattern.
Syntax:
A multiline modifier is utilized in the syntax alongside the regular expression applied to the input string.
/regexp/m
Description and rules
- The "m" modifier indicates a multiline match.
- It only has an impact on start ^ and end $'s behavior.
- The "^" indicates a string match at the beginning.
- The symbol $ signifies a match for a string's conclusion.
- The characters and $ also match at the start and end of each line when the "m" setting is enabled.
Examples
Below are some instances that assess and correspond with or without multiline flags.
Example 1:
The provided demonstration showcases the fundamental multiline modifier. It illustrates how the multiline information interacts with the modifier.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp m modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with m modifier </h2>
<p> The modifiers help to search a multiline data of the "java" in a string:</p>
<p id = "demo_case"> </p>
</div>
<script>
let text_input = `Example website :
the Javascript works
to operate
javascript methods`
//use regex global and multiline with the match method
let pattern_case = /java/gm;
let result_case = text_input.match(pattern_case);
document.getElementById("demo_case").innerHTML = result_case;
</script>
</body>
</html>
Output
The result displays the regular expression symbols that are present in the input data.
Example 2:
An illustration is provided below showcasing the fundamental multiline modifier. A comparison is made between utilizing multiline modifiers and not using them to highlight the distinction.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp m modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with m modifier </h2>
<p> Difference between global and case-insensitive with multiline modifier </p>
<p id = "demo_case"> </p>
<p id = "demo_case1"> </p>
</div>
<script>
let text_input = `Javatopint website :
the Javascript works
to operate
javascript methods`
//use regex global, multiline, and case-insensitive modifiers
let pattern_case = /java/gmi;
let result_case = text_input.match(pattern_case);
document.getElementById("demo_case").innerHTML = result_case;
//use regex global and multiline modifiers
let pattern_case1 = /java/gm;
let result_case1 = text_input.match(pattern_case1);
document.getElementById("demo_case1").innerHTML = result_case1;
</script>
</body>
</html>
Output
The result displays the necessary characters present in the provided input data.
Example 3:
Below is an example that demonstrates the functionality of a simple multiline modifier.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp m modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with m modifier </h2>
<p> The modifiers help to search a multiline data of the "java" in a string:</p>
<p id = "demo_case"> </p>
</div>
<script>
let text_input = `Example website :
the Javascript works
to operate
javascript methods`
//use regex global and multiline modifiers
let pattern_case = /java/gm;
let result_global = pattern_case.test(text_input);
document.getElementById("demo_case").innerHTML = result_global;
</script>
</body>
</html>
Output
The output displays the necessary characters that are present in the input information.
Example 4:
In this illustration, we will utilize a multiline modifier to verify the final word. Our objective is to locate the occurrence of the keyword "method" positioned at the conclusion of a line.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp m modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with m modifier </h2>
<p id = "demo_case"> </p>
</div>
<script>
let text_input = `methods of regex modifier :
the Javascript works
to operate
javascript Methods`
//use regex pattern with global, multiline, and case-insensitive modifiers
let pattern_case = /methods$/gmi;
let result_case = text_input.match(pattern_case);
document.getElementById("demo_case").innerHTML = result_case;
</script>
</body>
</html>
Output
Example 5:
An example provided below demonstrates the fundamental multiline modifier validation.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript RegExp m modifier
</title>
<style>
#demo1{
background-color: orange;
border: 1px solid black;
width: 370px;
}
</style>
</head>
<body>
<div id = "demo1">
<h2> JavaScript Regular Expressions with m modifier </h2>
<p> Check whether a multiline modifier is available or not: </p>
<p id = "demo_case"> </p>
</div>
<script>
let text_input = `Example website :
the Javascript works
to operate
javascript methods`;
//use regex global, multiline, and case-insensitive modifiers
let pattern_case = /java/gmi;
let result_global = pattern_case.multiline;
//output shows the Boolean value with a multiline keyword
document.getElementById("demo_case").innerHTML = result_global;
</script>
</body>
</html>
Output
The output displays the necessary characters that are present in the input data.
Conclusion
In summary, the modifier plays a crucial role in ensuring the correct functionality of regular expressions when working with input data in JavaScript.