从字符串

Question

考虑这种情况

var str1 = '^^ranbir$$this is first comment,,';
var str2 = ',,^^check$$this is another comment,,';
var str3 = ',,^^mike$$this is 3rd comment, but this is not the last one,,';

我希望各自的输出为

console.log(str1) // ^^ranbir$$this is first comment
console.log(str2) // ^^check$$this is another comment
console.log(str3) // ^^mike$$this is 3rd comment, but this is not the last one

基本上删除字符串开头和结尾的所有逗号。通过从堆栈溢出中尝试几个解决方案但是无法使其工作，我能够从字符串的第一个和最后一个中删除一个逗号。

Answer 1

统一解决方案，用于删除字符串开头和结尾的尾随逗号和可能的空格：

var str3 = ',,, ^^mike$$this is 3rd comment, but this is not the last one  ,,,,  ',
    replaced = str3.replace(/^\s*,+\s*|\s*,+\s*$/g, '');

console.log(replaced);

Answer 2

您可以匹配逗号之间的部分：

const re = /^,*(.*?),*$/;
const data = ',,,^^ranbir$$this is first comment,,';
const result = data.match(re);

console.log(result[1]);

Answer 3

var edited = test.replace(/^,|,$/g,'');

^，匹配字符串开头的逗号，$匹配结尾的逗号。

伪代码：foo包含（foo.replace（/ ^，|，$ / g，＆＃39;＆＃39;））;

来源：remove starting and ending comma from variable in javascript