regular expression question
Greg Snow wrote:
Here is another approach that still uses strspit if you want to stay with that:
tmp <- '(-0.791,-0.263].(-38,-1.24].(0.96,2.43]'
strsplit(tmp, '\\.(?=\\()', perl=TRUE)
[[1]]
[1] "(-0.791,-0.263]" "(-38,-1.24]" "(0.96,2.43]"
This uses the Perl 'look-ahead' indicator to say only match on a period that is followed by a '(', but don't include the '(' in the match.
right; you could extend this pattern to split the string by every dot
that does not separate two digits, for example:
strsplit(tmp, '(?<!\\d)\\.(?!\\d)', perl=TRUE)
of course, this fails if there are numbers without a leading zero, e.g., .11
vQ