僅在句子的開頭和結尾處替換空格

Question

有誰知道如何使用正則表達式和javascript用＆nbsp替換字符串開頭和結尾的空格；

例：

`   Hello World. The white spaces in between the sentence should not be replaced. Only the start and end should be replaced with &nbsp.   `

更換后：

`   Hello World. The white spaces in between the sentence should not be replaced. Only the start and end should be replaced with &nbsp.   `

Answer 1

您需要首先捕獲space然后在replace的回調函數中可以添加no。 的  根據比賽的長度。

• ^\\s+ -匹配字符串開頭的空格。
• | -與邏輯或相同。
• \\s+$ -匹配字符串末尾的空格

 let str = ` Hello World. The white spaces in between the sentence should not be replaced. Only the start and end should be replaced with &nbsp. ` let op = str.replace(/^\\s+|\\s+$/g, function(match){ return ` `.repeat(match.length) }) console.log(op)