ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
86 lines
1.8 KiB
Markdown
86 lines
1.8 KiB
Markdown
---
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id: 5d712346c441eddfaeb5bdef
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title: Match All Numbers
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challengeType: 1
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forumTopicId: 18181
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dashedName: match-all-numbers
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---
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# --description--
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You've learned shortcuts for common string patterns like alphanumerics. Another common pattern is looking for just digits or numbers.
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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.
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# --instructions--
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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.
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# --hints--
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Your regex should use the shortcut character to match digit characters
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```js
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assert(/\\d/.test(numRegex.source));
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```
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Your regex should use the global flag.
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```js
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assert(numRegex.global);
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```
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Your regex should find 1 digit in `"9"`.
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```js
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assert('9'.match(numRegex).length == 1);
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```
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Your regex should find 2 digits in `"Catch 22"`.
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```js
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assert('Catch 22'.match(numRegex).length == 2);
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```
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Your regex should find 3 digits in `"101 Dalmatians"`.
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```js
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assert('101 Dalmatians'.match(numRegex).length == 3);
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```
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Your regex should find no digits in `"One, Two, Three"`.
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```js
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assert('One, Two, Three'.match(numRegex) == null);
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```
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Your regex should find 2 digits in `"21 Jump Street"`.
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```js
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assert('21 Jump Street'.match(numRegex).length == 2);
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```
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Your regex should find 4 digits in `"2001: A Space Odyssey"`.
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```js
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assert('2001: A Space Odyssey'.match(numRegex).length == 4);
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```
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# --seed--
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## --seed-contents--
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```js
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let movieName = "2001: A Space Odyssey";
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let numRegex = /change/; // Change this line
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let result = movieName.match(numRegex).length;
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```
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# --solutions--
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```js
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let movieName = "2001: A Space Odyssey";
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let numRegex = /\d/g; // Change this line
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let result = movieName.match(numRegex).length;
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```
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