[R] R docs version switcher doesn't work on Safari on MacOS

[asfimport]

Reported as missing on Safari on MacOS by both Ian and Neal

Reporter: Nicola Crane / @thisisnic
Assignee: Nicola Crane / @thisisnic

PRs and other links:

• GitHub Pull Request #12819

_{Note: This issue was originally created as ARROW-15819. Please see the migration documentation for further details.}

[asfimport]

Nicola Crane / @thisisnic:
This issue is caused by the $pathEnd variable using a positive lookbehind regular expression, which is not supported on Safari.

To break down the regex in question...
"(?<=\/r).*"
?<= - this is a positive lookbehind - basically we want to look for something without including it in our returned result
\/r - the thing we want the lookbehind to look for
.* - any character except for line breaks 0 or more times - in other words, everything after "/r"

Fixing this might be as simple as using \/r.* instead and then subsequently chopping the \/r off of the end.

[asfimport]

Nicola Crane / @thisisnic:
Issue resolved by pull request 12819
#12819