How do I replace a specific occurrence of a string in a string?

Question

I have a string which may contain \"title1\" twice in it.

e.g.

server/api/shows?title1=its always sunny in philadelphia&title1=breaking ba

Answer 1

I found this link immediately on a google search.

C# - indexOf the nth occurrence of a string?

Get the IndexOf the first occurrence of the string.

Use the returned IndexOf's startIndex +1 for the starting position of the second IndexOf.

Substring it into two strings at the appropriate index of the "1" character.

Concat it back together with the "2" character.