freeCodeCamp/match-beginning-string-patterns.chinese.md at 2ca3a2093fb9359483442e0fadeda1ea0fefff86

Beau Carnes 2ca3a2093f Add languages Russian, Arabic, Chinese, Portuguese (#18305 )

2018-10-11 03:33:03 +05:30

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id, title, challengeType, videoUrl, localeTitle

id	title	challengeType	videoUrl	localeTitle
587d7db7367417b2b2512b9d	Match Beginning String Patterns	1		匹配开始字符串模式

Description

先前的挑战表明，正则表达式可用于寻找许多匹配。它们还用于搜索字符串中特定位置的模式。在之前的挑战中，您使用character set内的caret符（ ^ ）来创建[^thingsThatWillNotBeMatched]形式的negated character set 。在character set ， caret用于在字符串的开头搜索模式。

让firstString =“Ricky是第一个，可以找到。”;
让firstRegex = / ^ Ricky /;
firstRegex.test（firstString）;
//返回true
让notFirst =“你现在找不到Ricky了。”;
firstRegex.test（notFirst）;
//返回false

Instructions

使用正则表达式中的caret只能在字符串rickyAndCal的开头找到"Cal" 。

Tests

tests:
  - text: 你的正则表达式应该用大写字母搜索<code>&quot;Cal&quot;</code> 。
    testString: 'assert(calRegex.source == "^Cal", "Your regex should search for <code>"Cal"</code> with a capital letter.");'
  - text: 你的正则表达式不应该使用任何标志。
    testString: 'assert(calRegex.flags == "", "Your regex should not use any flags.");'
  - text: 你的正则表达式应该匹配字符串开头的<code>&quot;Cal&quot;</code> 。
    testString: 'assert(calRegex.test("Cal and Ricky both like racing."), "Your regex should match <code>"Cal"</code> at the beginning of the string.");'
  - text: 您的正则表达式不应与字符串中间的<code>&quot;Cal&quot;</code>匹配。
    testString: 'assert(!calRegex.test("Ricky and Cal both like racing."), "Your regex should not match <code>"Cal"</code> in the middle of a string.");'

Challenge Seed

let rickyAndCal = "Cal and Ricky both like racing.";
let calRegex = /change/; // Change this line
let result = calRegex.test(rickyAndCal);

Solution

// solution required

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