freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-numbers.md

id, title, challengeType, forumTopicId

id	title	challengeType	forumTopicId
5d712346c441eddfaeb5bdef	Match All Numbers	1	18181

--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;