Anyone any pointers about how to go about this properly?īonus marks for pointing me to a webpage that explains the difference between whatever I access with $, and attr. Looking at it now it doesn't seem too ugly, but the amount of messing about it's taken to get this utterly trivial thing working has been embarrassing. When using the -R flag, the name of the variable containing the content of the current line (not including the LF) is argn.
But in order to get what I'm after, rather than just using grep(pattern, alice, value = TRUE, perl = TRUE) I'm doing the following, which seems bad: reg.out <- regexpr(
Line 14: We call the grep() function with valueTRUE to return matching elements. Line 10: We call the grep() function with ignore.caseTRUE to ignore case. Line 7: We call the grep() function with ignore.caseFALSE to check case. Here's my R-flavoured regexp: pattern <- (?<=\\.D)(+)(?=.LIS) Lines 5 & 6: We call the grep() function with two parameters, 'car' as a pattern and x as a specified string vector. I was hoping that grep would return me the value of a capturing group rather than the whole string. I'd like grep to give me the number after the D that appears in some of these strings, conditional on the string containing "LIS" and an empty string or something otherwise. Example how to use grepl: x <- c (d, a, c, abba) grepl (a, x) 1 FALSE TRUE FALSE TRUE. Some of alice is printed out below: T.8EFF.SP.OT1.D5.VSVOVA#4 The grepl R function searches for matches of certain character pattern in a vector of character strings and returns a logical vector indicating which elements of the vector contained a match. I have a vector of strings, let's call it alice. Show actual element where the pattern is found (instead of the index only) with valueTRUE: Set valueTRUE grep(patternGen, xGenomics, valueTRUE). Apologies, because this seems like it should be so easy - I'm obviously just missing something. I have what is probably a really dumb grep in R question.
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