Count characters in files.
1 2  | 
.Object | 
 a directory with XML files  | 
regexCharsToKeep | 
 a regex defining the characters to keep  | 
xml | 
 logical, whether filename is a XML file, or not  | 
toLower | 
 logical, whether to to apply tolower to string read in  | 
decreasing | 
 logical, whether sort order is decreasing, or increasing, see documentation
for   | 
verbose | 
 logical, whether to be talkative  | 
... | 
 further parameters that will be passed into   | 
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