如何修剪单词之间的空格，以及使用javascript后的逗号

Question

我有一个名为name的字符串，我希望修剪一个句子中的单词之间的空格，并在逗号之后修剪空格。 我可以在句子的开头和结尾使用trim（）修剪额外的空格。
[我正在使用javascript来实现我的代码]

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.  

预期产出：

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

假设剩余的双空格只是一个拼写错误，您可以使用正则表达式匹配一个或多个空格，并用一个空格替换每个空格：

 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()函数

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

默认情况下，JavaScript中的string.replace将仅替换它找到的第一个匹配值，添加/ g将意味着替换所有匹配值。

g正则表达式修饰符（称为全局修饰符）基本上表示引擎在第一次匹配后不会停止解析字符串。

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)

有用的修饰符列表：

• g - 全球替换。 替换提供的文本中匹配字符串的所有实例。
• i - 不区分大小写的替换。 替换匹配字符串的所有实例，忽略大小写的差异。
• m - 多行替换。 应针对多行匹配测试正则表达式。

您可以将修饰符（例如g和i）组合在一起，以获得全局不区分大小写的搜索。