Question

how to replace some character b/w strings in c#?

suppose

string is : 1-2-5-7-8-9-10-15

i use replace function

when i replace 5 with 2

it also replace the last 15 to 12 because of 5 there.

so how can i get the right output?

Answer 1

You can use this:

yourString.Split("-").Select(s => Regex.Replace(s, "^5$", "2")).Aggregate((a,b) => a + "-" + b);

In contrast to most of the other answers here, this also handles the case, when the string to be replaced is at the beginning or the end of the input string.