You probably don't need to hear your own tells, so
Code:
\\aPC -?\d+ [^ :]+:(?<Player_100>[^ :]+)\\/a tells you, ?"(?<Message>.+)"
should be sufficient for the Regular Expression. You'll need to put something into the field you marked TTS however... in this case, what you wish to be spoken.
will probably work. If you added a results tab, it would create a table of players who sent you tells and the messages.
$1 causes the TTS engine to say the first column(player),
$2 causes it to say the message... the rest is verbatim. Since the capture groups in the Regex are named, you could use the following for the TTS as well:
Code:
${Player_100} tells you ${Message}