JavaScript: Alternet of trim function using regular expression

Last update on May 30 2022 09:58:43 (UTC/GMT +8 hours)

JavaScript validation with regular expression: Exercise-5 with Solution

Write a JavaScript program that works as a trim function (string) using regular expression.

Pictorial Presentation:

JavaScript: Alternet of trim function using regular expression

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Trim function using regular expression</title>
</head>
<body>
</body>
</html>

JavaScript Code:

function Trim(str)
{
  var result;
  if (typeof str === 'string') 
  {
    result = str.replace(/^\s+|\s+$/g, '');
    return result;
  }
  else
  {
    return false;
  }
}
console.log(Trim(' w3resource '));

Sample Output:

w3resource

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-5 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to search a date within a string.
Next:Write a JavaScript program to count number of words in string.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04