pdfmatch

[David Carlisle]

\pdfmatch is currently undefined

Options:

• Leave undefined
• Define to generate a more specifc error
• Define to take the right arguments but return -1 (invalid regex)
• Define to take the right arguments, convert "simple" regex to Lua patterns or return -1 (invalid regex) for rest
• Import a Lua regex library
• Implement using l3regex

[Joseph Wright]

I'd say this one is on the line of what we can do: it's very odd anyway. I'd favour having to 'fix' packages for this one, and issue an error if it's called.