freeCodeCamp/specify-exact-number-of-matches.chinese.md at ebcb34f3d952a7adf47cacdf1a61642c17aef82a

fix(i18n): update Chinese translation of regular expressions (#38042 )

Co-authored-by: Zhicheng Chen <chenzhicheng@dayuwuxian.com>

2020-08-04 12:44:01 +05:30

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id, title, challengeType, forumTopicId, localeTitle

id	title	challengeType	forumTopicId	localeTitle
587d7db9367417b2b2512ba7	Specify Exact Number of Matches	1	301365	指定匹配的确切数量

Description

可以使用带有花括号的数量说明符来指定匹配模式的上下限。但有时只需要特定数量的匹配。要指定一定数量的匹配模式，只需在大括号之间放置一个数字。例如，要只匹配字母a出现3次的单词"hah"，正则表达式应为/ha{3}h/。

let A4 = "haaaah";
let A3 = "haaah";
let A100 = "h" + "a".repeat(100) + "h";
let multipleHA = /ha{3}h/;
multipleHA.test(A4); // Returns false
multipleHA.test(A3); // Returns true
multipleHA.test(A100); // Returns false

Instructions

修改正则表达式timRegex，以匹配仅有四个字母单词m的单词"Timber"。

Tests

tests:
  - text: 你的正则表达式应该使用花括号。
    testString: assert(timRegex.source.match(/{.*?}/).length > 0);
  - text: "你的正则表达式不应该匹配<code>'Timber'</code>。"
    testString: assert(!timRegex.test("Timber"));
  - text: "你的正则表达式不应该匹配<code>'Timmber'</code>。"
    testString: assert(!timRegex.test("Timmber"));
  - text: "你的正则表达式不应该匹配<code>'Timmmber'</code>。"
    testString: assert(!timRegex.test("Timmmber"));
  - text: "你的正则表达式应该匹配<code>'Timmmmber'</code>。"
    testString: assert(timRegex.test("Timmmmber"));
  - text: "你的正则表达式不应该匹配包含 30 个字母<code>m</code>的<code>'Timber'</code>。"
    testString: assert(!timRegex.test("Ti" + "m".repeat(30) + "ber"));

Challenge Seed

let timStr = "Timmmmber";
let timRegex = /change/; // Change this line
let result = timRegex.test(timStr);

Solution

let timStr = "Timmmmber";
let timRegex = /Tim{4}ber/; // Change this line
let result = timRegex.test(timStr);

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