How to match specific quantity in javascript

Explanation

1. The number of curly bracket specifiers can be used to specify the upper and lower limits of the matching pattern. But sometimes only a specific number of matches is needed.

2. To specify a certain number of matching patterns, just place a number between the curly brackets.

Example

要求
修改正则表达式timRegex，以匹配仅有四个字母 m 的单词 Timber。
let timStr = "Timmmmber";
let timRegex = /change/; // 修改这一行
let result = timRegex.test(timStr);
 
参考
let timStr = "Timmmmber";
let timRegex = /tim{4}ber/i; // 修改这一行
let result = timRegex.test(timStr);

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