How to usea Loop and Character Checking in Javascript
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.
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
JavaScript Program to Remove Non-Alphanumeric Characters from a String
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.
Table of Content
- Approach 1: Using Regular Expressions
- Approach 2: Using a Loop and Character Checking
- Approach 3: Using the replace() Method with a Custom Function
- Approach 4: Using Array Filter and Regular Expression
- Approach 5: Using the reduce() Method
- Approach 6: Using Array Map and Join
We will explore all the above methods along with their basic implementation with the help of examples.
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