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>
91 lines
2.3 KiB
Markdown
91 lines
2.3 KiB
Markdown
---
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id: 587d7db8367417b2b2512ba0
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title: Match Everything But Letters and Numbers
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challengeType: 1
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forumTopicId: 301353
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dashedName: match-everything-but-letters-and-numbers
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---
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# --description--
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You've learned that you can use a shortcut to match alphanumerics `[A-Za-z0-9_]` using `\w`. A natural pattern you might want to search for is the opposite of alphanumerics.
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You can search for the opposite of the `\w` with `\W`. Note, the opposite pattern uses a capital letter. This shortcut is the same as `[^A-Za-z0-9_]`.
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```js
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let shortHand = /\W/;
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let numbers = "42%";
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let sentence = "Coding!";
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numbers.match(shortHand); // Returns ["%"]
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sentence.match(shortHand); // Returns ["!"]
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```
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# --instructions--
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Use the shorthand character class `\W` to count the number of non-alphanumeric characters in various quotes and strings.
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# --hints--
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Your regex should use the global flag.
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```js
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assert(nonAlphabetRegex.global);
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```
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Your regex should find 6 non-alphanumeric characters in `"The five boxing wizards jump quickly."`.
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```js
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assert(
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'The five boxing wizards jump quickly.'.match(nonAlphabetRegex).length == 6
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);
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```
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Your regex should use the shorthand character to match characters which are non-alphanumeric.
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```js
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assert(/\\W/.test(nonAlphabetRegex.source));
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```
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Your regex should find 8 non-alphanumeric characters in `"Pack my box with five dozen liquor jugs."`
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```js
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assert(
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'Pack my box with five dozen liquor jugs.'.match(nonAlphabetRegex).length == 8
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);
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```
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Your regex should find 6 non-alphanumeric characters in `"How vexingly quick daft zebras jump!"`
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```js
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assert(
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'How vexingly quick daft zebras jump!'.match(nonAlphabetRegex).length == 6
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);
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```
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Your regex should find 12 non-alphanumeric characters in `"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."`
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```js
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assert(
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'123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ.'.match(nonAlphabetRegex)
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.length == 12
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);
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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 quoteSample = "The five boxing wizards jump quickly.";
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let nonAlphabetRegex = /change/; // Change this line
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let result = quoteSample.match(nonAlphabetRegex).length;
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```
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# --solutions--
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```js
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let quoteSample = "The five boxing wizards_jump quickly.";
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let nonAlphabetRegex = /\W/g; // Change this line
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let result = quoteSample.match(nonAlphabetRegex).length;
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```
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