JavaScript Validation with regular expression - Exercises, Practice, Solution
JavaScript Validation with regular expression [21 exercises with solution]
[An editor is available at the bottom of the page to write and execute the scripts. Go to the editor]
1. Write a JavaScript program to test whether the first character of a string is uppercase or not.
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2. Write a JavaScript program to check a credit card number.
Click me to see the solution
3. Write a pattern that matches e-mail addresses.
The personal information part contains the following ASCII characters.
- Uppercase (A-Z) and lowercase (a-z) English letters.
- Digits (0-9).
- Characters ! # $ % & ' * + - / = ? ^ _ ` { | } ~
- Character . ( period, dot or fullstop) provided that it is not the first or last character and it will not come one after the other.
4. Write a JavaScript program to search a date within a string.
5. Write a JavaScript program that works as a regular expression trim function (string).
6. Write a JavaScript program to count number of words in string.
Note :
-
Remove white-space from start and end position.
- Convert 2 or more spaces to 1.
- Exclude newline with a start spacing.
7. Write a JavaScript function to check whether a given value is IP value or not.
8. Write a JavaScript function to count the number of vowels in a given string.
Test Data :
console.log(alphabetize_string('United States'));
Output :
"SUadeeinsttt"
9. Write a JavaScript function to check whether a given value is a valid URL or not.
10. Write a JavaScript function to check whether a given value is alpha numeric or not.
11. Write a JavaScript function to check whether a given value is a time string or not.
12. Write a JavaScript function to check whether a given value is a US zip code or not.
13. Write a JavaScript function to check whether a given value is a UK Post Code or not.
14. Write a JavaScript function to check whether a given value is a Canada Post Code or not.
15. Write a JavaScript function to check whether a given value is a social security number or not.
16. Write a JavaScript function to check whether a given value is a hexadecimal value or not.
17. Write a JavaScript function to check whether a given value is a hexcolor value or not.
18. Write a JavaScript function to check whether a given value represents a domain.
19. Write a JavaScript function to check whether a given value is HTML or not.
20. Write a JavaScript function to check if a given value contains alpha, a dash and an underscore.
21. Write a JavaScript function to print an integer with thousands separated by commas.
Test Data :
console.log(thousands_separators(1000));
"1,000"
console.log(thousands_separators(10000.23));
"10,000.23"
console.log(thousands_separators(100000));
"100,000"
More to Come !
* To run the code mouse over on Result panel and click on 'RERUN' button.*
Live Demo:
See the Pen javascript-common-editor by w3resource (@w3resource) on CodePen.
Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.
JavaScript: Tips of the Day
Spread operator
const user = { name: 'Owen', age: 21 };
const admin = { admin: true, ...user };
console.log(admin);
It's possible to combine objects using the spread operator .... It lets you create copies of the key/value pairs of one object, and add them to another object. In this case, we create copies of the user object, and add them to the admin object. The admin object now contains the copied key/value pairs, which results in { admin: true, name: "Owen", age: 21 }.
Ref: https://bit.ly/323Y0P6
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