
Greetings R list,
 
I am stuck on a simple syntax problem. I want to list all files in a directory, excluding files of a certain type. I have tried pattern matching as follows:
 
 
a <- list.files(data, full.name = TRUE, pattern != ".xml")  # exclude all .xml files 
 
 
The warning returns that my syntax is incorrect. I have read the regexpr help files and search old posts to no avail. I'd be grateful if anyone would show me the proper syntax for specifying exclusion of certain file types. 
 
Thanks in advance for any help,
 
Zack
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