93 lines
2.3 KiB
Markdown
93 lines
2.3 KiB
Markdown
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---
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id: 587d7db8367417b2b2512ba0
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title: 匹配除了字母和數字的所有符號
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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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已經瞭解到可以使用縮寫 `\w` 來匹配字母和數字 `[A-Za-z0-9_]`。 不過，有可能想要搜尋的匹配模式是非字母數字字符。
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可以使用 `\W` 搜尋和 `\w` 相反的匹配模式。 注意，相反匹配模式使用大寫字母。 此縮寫與 `[^A-Za-z0-9_]` 是一樣的。
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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);
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sentence.match(shortHand);
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```
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第一次 `match` 調用將返回值 `["%"]` 而第二次調用將返回 `["!"]`。
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# --instructions--
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使用縮寫 `\W` 來計算引號中所有非字符字母和數字字符的數量。
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# --hints--
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你的正則表達式應該使用全局標識。
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```js
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assert(nonAlphabetRegex.global);
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```
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你的正則表達式應該在 `The five boxing wizards jump quickly.` 中匹配到 6 個非字母數字字符。
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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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正則表達式應該使用元字符來匹配非字母字符。
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```js
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assert(/\\W/.test(nonAlphabetRegex.source));
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```
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你的正則表達式應該在 `Pack my box with five dozen liquor jugs.` 中匹配到 8 個非字母數字字符。
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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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你的正則表達式應該在 `How vexingly quick daft zebras jump!` 中匹配到 6 個非字母數字字符。
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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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你的正則表達式應該在字符串 `123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ.` 中找到12個非字母數字字符。
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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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