正则表达式在第一次出现后删除字符串中的;＃

Question

I need help in building a regex to help me remove ;# in a string and replace it with a , after the first occurrence. For the first occurrence of the the ;# I want to remove it and subsequent ;# I want to replace with a ,. An example of what I am looking for is below:

;#something@domain.com;#something2@domain2.com;#

needs to end up being:

something@domain.com,something2@domain.com

Answer 1

replace ";#" with "," and then trim the first and the end ","

string input = ";#something@domain.com;#something2@domain2.com;#";
string afterEdit = input.Replace(";#", ",").TrimStart(',').TrimEnd(',');