[R-pkg-devel] perl = TRUE fails on ubuntu

[Josiah Parry]

Hi all,

I've encountered an issue where using `perl = TRUE` for regular expressions
with grepl() causes an error on ubuntu CI runners only.

Is this a known limitation of perl = TRUE for grep and family in base R? Or
is there a suggested workaround?

The issue is specifically with lookbehinds:

PCRE pattern compilation error
'lookbehind assertion is not fixed length'
at '(?<=(FeatureServer|MapServer)/)[0-9]+/?$'

Any guidance would be very much appreciated! I'd like to avoid adding a
stringi dependency if possible.

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