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added 87 characters in body

edited Mar 4, 2023 at 15:34

edited Mar 4, 2023 at 15:34

Java (JDK), 142 bytes

s->{var m=new java.util.TreeMap();for(var c:s.toLowerCase().replaceAll("[^a-z]","").toCharArray())m.merge(c,1,(a,b)->(int)a+(int)b);return m;}

Saved 9 bytes thanks to Kevin Cruijssen.

answered Mar 3, 2023 at 21:41