I'll submit a bug report.
On 25/01/2023 8:38 p.m., Andrew Simmons wrote:
It seems like a bug to me. Using perl = TRUE, I see the desired result:
```
x <- "\n```html\nblah blah \n```\n\n```r\nblah blah\n```\n"
pattern2 <- "\n([`]{3,})html\n.*?\n\\1\n"
cat(regmatches(x, regexpr(pattern2, x,
It seems like a bug to me. Using perl = TRUE, I see the desired result:
```
x <- "\n```html\nblah blah \n```\n\n```r\nblah blah\n```\n"
pattern2 <- "\n([`]{3,})html\n.*?\n\\1\n"
cat(regmatches(x, regexpr(pattern2, x, perl = TRUE)))
```
If you change it to something like:
```
x <- c(
Thanks for pointing out my mistake. I oversimplified the real problem.
I'll try to post a version of it that comes closer: Suppose I have a
string like this:
x <- "\n```html\nblah blah \n```\n\n```r\nblah blah\n```\n"
If I cat() it, I see that it is really markdown source:
```html
Perhaps
sub( "^.*(a.*?a).*$", "\\1", x )
On January 25, 2023 4:19:01 PM PST, Duncan Murdoch
wrote:
>The docs for ?regexp say this: "By default repetition is greedy, so the
>maximal possible number of repeats is used. This can be changed to ‘minimal’
>by appending ? to the quantifier.
On 25/01/2023 7:19 p.m., Duncan Murdoch wrote:
The docs for ?regexp say this: "By default repetition is greedy, so the
maximal possible number of repeats is used. This can be changed to
‘minimal’ by appending ? to the quantifier. (There are further
quantifiers that allow approximate matching:
grep(value = TRUE) just returns the strings which match the pattern. You
have to use regexpr() or gregexpr() if you want to know where the matches
are:
```
x <- "abaca"
# extract only the first match with regexpr()
m <- regexpr("a.*?a", x)
regmatches(x, m)
# or
# extract every match with
The docs for ?regexp say this: "By default repetition is greedy, so the
maximal possible number of repeats is used. This can be changed to
‘minimal’ by appending ? to the quantifier. (There are further
quantifiers that allow approximate matching: see the TRE documentation.)"
I want the
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