readme filter additions

README.md

@@ -171,21 +171,36 @@ sudo bash -c "$(wget -nv -O - https://github.com/wiedehopf/tar1090/raw/master/un
 
 ## Using the filters
 
-js regex can be used, some examples:
+js regex format, some basics (much more extensive issue available online on javascript regex syntax):
+
+- a single `.` is the wildcard for exactly one character
+- multiple patterns can be combined with or: `|`
+
+### Some examples of useful constructs:
+
+#### Filter by type code:
 
-- Filter by type code:
 ```
+B737 family: B73. (B73 and any character in the fourth position)
+A320 family: A32.
+B737-900 and B737 Max 9: B739|B39M
+737 family including max: B73.|B3.M
+B737 / A320 families: B73.|B3.M|A32.|A2.N
 Only A320 and B737 models: A32|B73
-Exclude: ^(?!A320)
-Exclude multiple: ^(?!(A32|B73))
+Exclude a certain type: ^(?!A320)
+Exclude multiple patterns: ^(?!(A32.|B73.))
 ```
-- Filter by type description:
+
+#### Filter by type description:
+
 ```
-Only helicopters: H
-Only planes (land): L
-Jets or turboprops: J|T
-Only piston engined: P
-Number of engines: 2
+Helicopters: H..
+Landplanes with 2 jet engines: L2J
+Landplanes with any number of piston engines: L.P
+Helicopters any number of turbin engines : H.T
+All turboprop powered things, including turbine helicopters: ..T
+Everything with 4 engines: .4.
+Everything with 2 3 and 4 engines: .2.|.3.|.4.
 ```
 
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