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

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

Do a web search for “ pcre re format” and it will take you here https://www.pcre.org/original/doc/html/pcresyntax.html that explains all the syntax.

Barry