Regular Expressionsionism
"Derek Eder" <Derek.Eder at neuro.gu.se> writes:
Isn't there a cryptic footnote somewhere in the blue book that describes regular expressions as "a funny little language ..." ? Well, I'm not laughing! I've googled and Man paged, but the GREP-style solution to the following problem still eludes me: ... Using a regular expression in the "pattern" argument to list.files() to restrict the return to filenames which contain both "Elstim" and "post". E.g.,
list.files()
...
[133] "J30710_Control_msa_amplitude_5_25_s1-30w.pre"
[134] "J30710_Elstim_msa_amplitude_5_25_s1-30w.post"
[135] "J30710_Elstim_msa_amplitude_5_25_s1-30w.pre"
[136] "J30712_Control_msa_amplitude_5_25_s1-41_44-46_48w.post"
[137] "J30712_Control_msa_amplitude_5_25_s1-41_44-46_48w.pre"
[138] "J30712_Elstim_msa_amplitude_5_25_s1-17_19-43_45_48w.post"
I have not found the key to generating the logical AND equivalent of the "|" OR infix operator, a
proxy for the simpleton's dream: my.list.files(pattern="*Elstim" & "*post")
As long a you know the order, how about "Elstim.*post" ?
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._