Send Bold And Underlined Text In Facebook Chat

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For Sending Bold Text
-Whatever you type between * *(two stars ) will automatically turns into bold.
Example : You write

I *really* mean it.
Turns to
I really mean it.

For Sending underlined Text
-Whatever you type between _ _(two underscores) will automatically turns into underlined text
Example : You write

I really _mean_ it.
Turns to
I really mean it.

For Sending Bold+Underline
-Whatever you type between *_ _* will automatically turns into Bold+Underline
Example : You Write

You *_mean_* it?
Turns to
You mean it?