JavaScript Program to Remove Non-Alphanumeric Characters from a String
Last Updated :
26 Sep, 2023
In this article, we will see how to remove non-alphanumeric characters from a string in JavaScript. Non-alphanumeric characters are symbols, punctuation, and whitespace. Removing them from a string This task can be useful when you want to clean up user inputs, sanitize strings, or perform various text processing operations.
There are multiple approaches to removing non-alphanumeric characters from a string in JavaScript.
We will explore all the above methods along with their basic implementation with the help of examples.
Regular expressions offer a concise way to match and remove non-alphanumeric characters. We can use the replace() method with a regular expression to replace all non-alphanumeric characters with an empty string.
Syntax:
function removeNonAlphanumeric(inputString) {
return inputString.replace(/[^a-zA-Z0-9]/g, '');
};
Example: In this example we are using the above-explained approach.
Javascript
function removeFunction(inputString) {
return inputString.replace(/[^a-zA-Z0-9]/g, '' );
}
const originalString =
"Hello! This is 123 a test string." ;
const result =
removeFunction(originalString);
console.log(result);
|
Output
HelloThisis123ateststring
Approach 2: Using a Loop and Character Checking
By iterating through each character in the string and checking if it’s alphanumeric, we can construct the resulting string without non-alphanumeric characters.
Syntax:
for (let i = 0; i < inputString.length; i++) {
const char = inputString[i];
if (/[a-zA-Z0-9]/.test(char)) {
result += char;
}
};
Example: In this example we are using the above-explained approach.
Javascript
function removeFunction(inputString) {
let result = '' ;
for (let i = 0; i < inputString.length; i++) {
const char = inputString[i];
if (/[a-zA-Z0-9]/.test(char)) {
result += char;
}
}
return result;
}
const originalString =
"Hello! This is 123 a test string." ;
const result =
removeFunction(originalString);
console.log(result);
|
Output
HelloThisis123ateststring
Approach 3: Using the replace() Method with a Custom Function
The replace() method can be used with a custom function that checks each character and replaces non-alphanumeric characters.
Syntax:
function removeNonAlphanumeric(inputString) {
return inputString.replace(/./g, char => {
if (/[a-zA-Z0-9]/.test(char)) {
return char;
}
return '';
});
}
Example: In this example we are using the above-explained approach.
Javascript
function romveFunction(inputString) {
return inputString.replace(/./g, char => {
if (/[a-zA-Z0-9]/.test(char)) {
return char;
}
return '' ;
});
}
const originalString =
"Hello! This is 123 a test string." ;
const result =
romveFunction(originalString);
console.log(result);
|
Output
HelloThisis123ateststring
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