如何修剪單詞之間的空格，以及使用javascript后的逗號

Question

我有一個名為name的字符串，我希望修剪一個句子中的單詞之間的空格，並在逗號之后修剪空格。 我可以在句子的開頭和結尾使用trim（）修剪額外的空格。
[我正在使用javascript來實現我的代碼]

name = '      Barack Hussein       Obama II is an     American politician who served       as the 44th President        of the United States from January 20,    2009,    to January 20, 2017.  

預期產出：

name = ' Barack Hussein  Obama II is an American politician who served  as the 44th President of the United States from January 20, 2009, to January 20, 2017. 

Answer 1

假設剩余的雙空格只是一個拼寫錯誤，您可以使用正則表達式匹配一個或多個空格，並用一個空格替換每個空格：

 const name1 = ' Barack Hussein Obama II is an American politician who served as the 44th President of the United States from January 20, 2009, to January 20, 2017.'; console.log( name1.replace(/ +/g, ' ') ); 

Answer 2

在angularjs中，您可以使用trim()函數

const nameStr = '      Barack Hussein       Obama II is an     American politician who served       as the 44th President        of the United States from January 20,    2009,    to January 20, 2017.';

console.log(nameStr.replace(/\s+/g, ' ').trim());

Answer 3

 let msg = ' Barack Hussein Obama II is an American politician who served as the 44th President of the United States from January 20, 2009, to January 20, 2017.'; console.log(msg.replace(/\\s\\s+/g, ' ')); 

Answer 4

默認情況下，JavaScript中的string.replace將僅替換它找到的第一個匹配值，添加/ g將意味着替換所有匹配值。

g正則表達式修飾符（稱為全局修飾符）基本上表示引擎在第一次匹配后不會停止解析字符串。

var string = "      Barack Hussein       Obama II is an     American politician who served       as the 44th President        of the United States from January 20,    2009,    to January 20, 2017."
alert(string)
string = string.replace(/ +/g, ' ');
alert(string)

有用的修飾符列表：

• g - 全球替換。 替換提供的文本中匹配字符串的所有實例。
• i - 不區分大小寫的替換。 替換匹配字符串的所有實例，忽略大小寫的差異。
• m - 多行替換。 應針對多行匹配測試正則表達式。

您可以將修飾符（例如g和i）組合在一起，以獲得全局不區分大小寫的搜索。