Giulio -
This
sub('^.* ?(Rv[^ ]*) ?.*$','\\1',a)
[1] "Rv3018c" "Rv1135c" "Rv1548c" "Rv0755c" "Rv3367"
seems to do what you want.
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Mon, 28 Jun 2010, Giulio Di Giovanni wrote:
Hi everybody,
I'm quite weak with regular expression, and I need some help...
I have strings of the type
a
[1,] "ppe46 Rv3018c MT3098/MT3101 MTV012.32c"
[2,] "ppe16 Rv1135c MT1168"
[3,] "ppe21 Rv1548c MT1599 MTCY48.17"
[4,] "ppe12 Rv0755c MT0779"
[5,] "PE_PGRS51 Rv3367"
[etc..for several hundreds]
I want have instead only:
[1,] "Rv3018c"
[2,] "Rv1135c"
[3,] "Rv1548c"
[4,] "Rv0755c"
[5,] "Rv3367"
Besides these examples, the only thing I know for sure is that the "magic" substrings I want to
extract are entire word all starting by "Rv". So "Rvxxxxx", preceded and followed by a
space, and of a variable length. I don't have any other infos.
Do you know how to pick them? I checked for their presence using grep, and
"\\<Rv*\\>" expression, I tried with some string functions from Hmisc, or in
the other way, by substituting with empty strings everything except the Rv word, but I didn't
achieve that much...
Could you please give me some suggestions?
Thanks a lot,
Giulio
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