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In this post, you will find the solution for Day 7: Regular Expressions II in JavaScript-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.
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Introduction To JavaScript
JavaScript is a lightweight, cross-platform, and interpreted scripting language. It is well-known for the development of web pages, many non-browser environments also use it. JavaScript can be used for Client-side developments as well as Server-side developments. JavaScript contains a standard library of objects, like Array, Date, and Math, and a core set of language elements like operators, control structures, and statements.
Advantages of JavaScript
The merits of using JavaScript are −
- Less server interaction − You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.
- Immediate feedback to the visitors − They don’t have to wait for a page reload to see if they have forgotten to enter something.
- Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.
- Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.
Link for the Problem – Day 7: Regular Expressions II – Hacker Rank Solution
Day 7: Regular Expressions II – Hacker Rank Solution
Problem:
Task
Complete the function in the editor below by returning a RegExp object, , that matches any string satisfying both of the following conditions:
- String starts with the prefix
Mr.
,Mrs.
,Ms.
,Dr.
, orEr.
- The remainder of string (i.e., the rest of the string after the prefix) consists of one or more upper and/or lowercase English alphabetic letters (i.e.,
[a-z]
and[A-Z]
).
Constraints
- The length of string is .
Output Format
The function must return a RegExp object that matches any string satisfying both of the given conditions.
Sample Input 0
Mr.X
Sample Output 0
true
Explanation 0
This string starts with Mr.
, followed by an English alphabetic letter (X
).
Sample Input 1
Mrs.Y
Sample Output 1
true
Explanation 1
This string starts with Mrs.
, followed by an English alphabetic letter (Y
).
Sample Input 2
Dr#Joseph
Sample Output 2
false
Explanation 2
This string starts with Dr#
instead of Dr.
, so it’s invalid.
Sample Input 3
Er .Abc
Sample Output 3
false
Explanation 3
This string starts with Er
but there is a space before the period (.
), making the string invalid.
Day 7: Regular Expressions II – Hacker Rank Solution
function regexVar() { // Declare a RegExp object variable named 're' // It must match a string that starts with 'Mr.', 'Mrs.', 'Ms.', 'Dr.', or 'Er.', // followed by one or more letters. let re = /^(Mr|Mrs|Ms|Dr|Er)(\.)([a-zA-Z])+$/; return re; }