![]() ![]() `\` itself is a special character that needs escape, e.g. `` has to be used inside square brackets, e.g. : printable characters, equivalent to \\s]. : graphical (human readable) characters: equivalent to ]. # Examples of subsetting numbers from image file names > threshold.y.2 ) # class(ss) "expression" > threshold.y.1 ) # class(ss) "expression"Įxpression.2 threshold.x.2 &. # Evaluate the expression and use the filtration conditions to filter dataĭ.1 % dplyr::filter(eval(expression.1)) # dim(d.1) 5 4ĭ.2 % dplyr::filter(eval(expression.2)) # dim(d.2) 2 4ĭ.3 % dplyr::filter(eval(expression.3)) # dim(d.3) 1 4 # Add the filtration conditions abve to expression objectsĮxpression.1 0.3 &. # Specify fitration condtions as expression objects and evaulate them in dplyr::filter()ĭ % dplyr::filter(.> 0.3 &. # Extract assignment ID as 4 digit numbers at the end of. # Extract numbers of varying length from the end of stringsĭplyr::mutate(have= stringr::str_remove_all( string=file.names # Regular expression, expression, and string manipualtion in R # tags: `R` `grep` `list.files` `basename` `dirname` `regex` `Sys.glob` `py` `unlink` `gsub` `as.numeric` `strsplit` `glob2rx` `Sys.genenv` `dplyr::bind_rows` `dplyr::filter` `dplyr::mutate` `grepl` `names` `stringr::str_replace_all` `stringr::str_extract` `sub` `expression` `eval`
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