从字符串的开头和结尾删除多个逗号

Question

Consider this scenario

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,,';

I want the respective outputs to be

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

Basically remove all the commas at the start and end of the string. I was able to remove just one comma from the first and last of the string by trying couple of solutions from stack overflow but could not make it work.

Answer 1

Unified solution for removing trailing commas and possible spaces at the start and end of the string:

 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

You could match the part between the commas:

 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,'');

^, matches the comma at the start of the string and ,$ matches the comma at the end.

pseudo code: while foo contains ( foo.replace(/^,|,$/g,'') );

source: remove starting and ending comma from variable in javascript