Before I start changing it locally, I'm wondering if a temperature log like this should be filtered out:
Recv: ok N5993 P15 B15 T:59.2 /0.0 B:31.8 /0.0 T0:59.2 /0.0 @:0 B@:100:
If I compare it to the regex (below) the difference is significant, there unexpected "N" and "P" parameters in there. Should it match? I mean, is there a reason to leave these out?
(Send: (N\d+\s+)?M105)|(Recv:\s+(ok\s+)?(B|T\d*):)I wonder if the N\d* is automatically removed before the regex'ing... (plus the checksum)? If so, you're now just down to the unexpected P\d*.
Knowing the printer and/or firmware might help.
yeah, perhaps 'N' is removed already.
It's the MP Mini Delta, which runs some version of Marlin.
You might consider tweaking that in Settings -> Terminal filters, btw. It's not like you have to "hack the mainframe" or anything. 
Yeah, of course. Regexes are trivial. I'm just wondering why.
To me, the firmware is doing something unexpected. :shrugs:
Yeah, trying to figure out why/how. @foosel saw the P15/B15 entries, which makes me think it isn't that weird.
Comparing, here's the output from a Prusa:
Recv: ok T:210.3 /210.0 B:60.0 /60.0 T0:210.3 /210.0 @:85 B@:53 P:37.5 A:40.8
I can't find a reference for much of the output format. 
Welcome to my life
My guess is the P and B values in the first example are buffer information regarding the internal command buffer and the planner buffer for the motion planner. N is the line number that was acknowledged. Those are optional and only even available in recent firmware builds (enhanced ok or something like that it was called I think, at least in Marlin - no idea about other firmware variants). I wasn't aware that they might show up in temperature responses, but it does make sense in a way.
T is the currently selected hotend, T0 the first, T1 the second and so on, B is the bed. @: and B@: denote the current power level of the heaters I think.
I so far have never seen the P: notation. No idea what that is supposed to mean. Also no idea about A: in this context.
In any case, to filter out those lines that contain the P and B values before the temperature output, I'd try the following regex:
(Send: (N\d+\s+)?M105)|(Recv:\s+(ok\s.*)?(B|T\d*):)
Do you want me to put in a PR for an upgraded regex? Also yours was incorrect, it was missing the B entry (maybe you accidentally pasted in the default version?). I'm also fussing with the colon location in this version:
(Send: (N\d+\s+)?M105)|(Recv:\s+(ok\s.*)?([PBT]:?\d*))
next iteration, trying to stay with the spirit of the original by ensuring we find an entry with a colon and avoiding the .*.
(Send: (N\d+\s+)?M105)|(Recv:\s+(ok\s+)?([NPBT]\d*\s?)*:)
Of course, it could possibly be simplified to this if you are okay with it matching more things:
(Send: (N\d+\s+)?M105)|(Recv:\s+(ok\s+)?.*T\d*:\d+)
The idea behind the .* bits in mine was to capture anything like N, P, B and so on that went before a T:, T\d: or B: - but I admittedly also didn't test it so might have gone a bit over board there
PR against maintenance would be welcome 
linking for context:
I´m sorry if this is not the right place, but I´d like to know if its possible to filter temperature messages from the terminal as default. Every time I disconnect and reconnect my printer and goes to terminal, I get tons of temperature messages covering other info I want to look at.
I just looked in terminal.js and terminal.jinja2 and don't see that it is plumbed through. It's a great feature request, though.