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

[Ben Bolker]

https://stackoverflow.com/questions/3796436/whats-the-technical-reason-for-lookbehind-assertion-must-be-fixed-length-in-r

On Tue, May 27, 2025, 4:07 PM Josiah Parry <josiah.parry using gmail.com> wrote:

> 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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>
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