Regex - basic string replacement

I have a string which may or may not contain a code for an emote, all of which begin the same: "auroraa1"

Such as:
"auroraa1Smile", "auroraa1Bye", "aurraa1Love"

I need to be able to grab the whole code for a given emote without any of the spaces before/after and alter it.

In a sentence such as:

"Hello Aurora! auroraa1Smile How are you?"

I need to alter it to:

"Hello Aurora! [emote:4771491:auroraangel79Smile] How are you?"

Question:

How can I create a regex to capture the emote code from the source string: auroraa1Hi

My current code:

//read the twitchMsg and look for "auroraa1" which denotes an emote string wordToFind = "auroraa1"; string kickMsg = "NONE"; kickMsg = CPH.GetGlobalVar<string>("s_msg"); // Find all occurrences of the wordToFind as a whole word MatchCollection matches = Regex.Matches(kickMsg, $@"{wordToFind}", RegexOptions.IgnoreCase); if (matches.Count > 0) { CPH.SendMessage($"'{wordToFind}' found {matches.Count} times as a whole word."); foreach (Match match in matches) { CPH.SendMessage($"Found at index: {match.Index}"); } } else { CPH.SendMessage($"'{wordToFind}' not found as a whole word."); } return true;

Here's the ouput I am getting:
'auroraa1' found 1 times as a whole word.
Found at index: 28

I need output to say that it found 'auroraa1Smile'