It looks like it's trying to match an ANSI escape sequence - but it hurts my eyes to look at it for more than a couple of seconds.
Code:
\e is an escape
Followed by '[0G'
Followed by 1 or more characters that aren't an escape
Followed by an escape
Followed by '[10G'
Followed by 1 or more characters that aren't an escape
Followed by an escape
etc.
Could it be matching the escape codes from a screen output?