1.8 KiB
| id | title | challengeType | forumTopicId | dashedName |
|---|---|---|---|---|
| 5d712346c441eddfaeb5bdef | Match All Numbers | 1 | 18181 | match-all-numbers |
--description--
You've learned shortcuts for common string patterns like alphanumerics. Another common pattern is looking for just digits or numbers.
The shortcut to look for digit characters is \d, with a lowercase d. This is equal to the character class [0-9], which looks for a single character of any number between zero and nine.
--instructions--
Use the shorthand character class \d to count how many digits are in movie titles. Written out numbers ("six" instead of 6) do not count.
--hints--
Your regex should use the shortcut character to match digit characters
assert(/\\d/.test(numRegex.source));
Your regex should use the global flag.
assert(numRegex.global);
Your regex should find 1 digit in "9".
assert('9'.match(numRegex).length == 1);
Your regex should find 2 digits in "Catch 22".
assert('Catch 22'.match(numRegex).length == 2);
Your regex should find 3 digits in "101 Dalmatians".
assert('101 Dalmatians'.match(numRegex).length == 3);
Your regex should find no digits in "One, Two, Three".
assert('One, Two, Three'.match(numRegex) == null);
Your regex should find 2 digits in "21 Jump Street".
assert('21 Jump Street'.match(numRegex).length == 2);
Your regex should find 4 digits in "2001: A Space Odyssey".
assert('2001: A Space Odyssey'.match(numRegex).length == 4);
--seed--
--seed-contents--
let movieName = "2001: A Space Odyssey";
let numRegex = /change/; // Change this line
let result = movieName.match(numRegex).length;
--solutions--
let movieName = "2001: A Space Odyssey";
let numRegex = /\d/g; // Change this line
let result = movieName.match(numRegex).length;