Ever get pinged because your @username was mentioned in a chat room? This block will get you started with that same flow. It parses all messages that travel through the channel. If that message has a @username mention in it, it forwards the message to the @username channel.
Any message sent over your channel will be parsed for the @username using a regular expression. If @username is detected, the same message is forwarded to the @username channel. The original message still reaches the intended target.
In production every user should have their own @username channel that is locked down with PubNub PAM so only they can access it.
A message is published on the input channel: user-mention-channel
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Note that the message is identical, but the new message has been duplicated and sent to a channel called @username.
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