I found this: https://github.com/wiedehopf/tar1090/blob/master/README-query.md
/?filterAltMax=5000 ::For 5,000 feet max
Does anyone know what flavor of REGEX is being used? The operators are very limited.
That's not working today for some reason. Try ^(?!1200) instead.
Yeah, I wasn't too sure about 7000's explanation. Otherwise use: "7500|7600|7700"
Filter by squawk: "7000|7500|7600|7700" (use what is inside quotes"
Filter by callsign: "no .." (use what is inside quotes)
Filter by squawk: !1200
Separate names with a comma.