Question

Below I have two regex’s that operate on some text:

assume key = “old” and value = “new”

text = Regex.Replace(text,
    "\\." + change.Key + ",",
    "." + change.Value + ","
    );
text = Regex.Replace(text,
    "\\." + change.Key + ";",
    "." + change.Value + ";"
    );

So, “.old,” and “.old;” would change to “.new,” and “.new;”, respectively.

I’m sure this could be shortened to one regex. How can I do this so that the string only changes when the comma and semicolon are at the end of the variable? For example, I don’t want “.oldQ” to change to “.newQ”. Thanks!

Answer 1

.NET uses $ for backreferences:

text = Regex.Replace(text,
    @"\." + change.Key + "([,;])",
    "." + change.Value + "$1");