Re: Combining two tiny scripts

[Philippe Verdy <verdyp@...>]

Ow, my Lua supports '?' quantifiers on capture groups. Looks like core Lua doesn't.

Alternative (note: the patterns are anchored now at start and end, to match whole string before making any substitution):

link.target = link.target

  :gsub('^(.+)%.md#(.*)$', '%1.html#%2')

  :gsub('^(.+)%.md$', '%1.html')

 

 

Le mar. 26 janv. 2021 à 05:15, Peter Matulis <pmatulis@gmail.com> a écrit :

It looks like the '?' quantifier can only apply to a single character or class of characters, not a matching pattern like '#.+'

On Mon, 25 Jan 2021 at 14:45, Peter Matulis <pmatulis@gmail.com> wrote:

On Thu, 21 Jan 2021 at 11:53, Philippe Verdy <verdyp@gmail.com> wrote:

Note that Lua patterns do not support alternatives with '|', but they support  '?' for 0 or 1 occurrence (not just '*' and '+' for 0+ and 1+ occurences).

Note also that you want to match the dot for the extension literally, not arbitrary characters, so you must use '%.', not '.'. The '#' does not need to be escaped by a '%' in the search pattern (however it still works if you do).

Just create a capture group for the optional anchor (*including* the leading '#').

function Link (link)
  link.target = link.target:gsub('(.+)%.md(#.+)?', '%1.html%2')
  return link
end

This does not work for me. Neither of the alternatives are acted upon. How should I debug this?

/pm