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Functions often get passed variables from within dataframes or other lists. However, printing these names with all their dollar signs isn't very userfriendly. This function simply uses a regular expression to extract the actual name.
extractVarName(x)
A character vector of one or more variable names.
The actual variables name, with all containing objectes stripped off.
# NOT RUN {
extractVarName('mtcars$mpg');
# }
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