Question

Is it possible using Regex.Replace to match a string, but only replace a portion of that matched string? Some way to mark part of the string that should be replaced with the replacement text parameter?

Answer 1

You can use groups to insert parts of the original string, or you can use lookbehind and lookahead.

Examples

Using Groups:

someString = Regex.Replace(someString, @"(before)content(after)", "$1new content$2");

Using lookaround:

someString = Regex.Replace(someString, @"(?<=before)content(?=after)", @"new content");