On Fri, 21 Feb 2025 at 17:13, Mike Wright <nobody@nospam.hostisimo.com> wrote:

Reading an article about a fedora kernel vulnerability regression and
found this PCRE expression
'(?<= )\w+' <--- actual expression

I got the "one or more words" part but what is the meaning of the part
inside the parens?

Adding to what others have already stated, you could also use some of the online regex explainers.

https://regex101.com/ maxes a decent go of breaking down the regex.