[chaley]

Originally Posted by ownedbycats

[...]
In an Action Chain, if I run this once, it produces the standardidentifier and does not delete the url: identifier. If I run it on a book that has both standard and url: identifiers it does delete the url:. Do I need to make it two separate actions/templates?

I verified that an Action Chains single field edit will replace the ids with the result of the template. Example: given identifiers of

ao3:1, goodreads:16967, uri:https://archiveofourown/works/12345, x:y

and the action chain

Spoiler:

{
  "ActionsChainMenus": {
    "Menus": [
      {
        "active": true,
        "chain_settings": {
          "chain_links": [
            {
              "action_name": "Single Field Edit",
              "action_settings": {
                "col_name": "identifiers",
                "template": "program:\n\tlist_difference($identifiers, 'ao3:1', ',')",
                "value_type": "template"
              },
              "comment": ""
            }
          ],
          "refresh_gui": true
        },
        "image": "",
        "menuText": "Test identifiers",
        "subMenu": ""
      }
    ]
  },
  "schemaVersion": 1.8
}

then the result is

goodreads:16967, uri:https://archiveofourown/works/12345, x:y

The ao3:1 identifier is removed. I can't say why it doesn't work for you. I suggest you put print() statements in it so you can verify exactly the result of the template.

FWIW: the

n = re(u, '^^https://standardebooks.org/ebooks/()', '\1');

is strange. The \1 will always result in the empty string because the grouping () contains no pattern, so why is it there? I also don't know why there are two ^ anchors in the front. I think you mean

n = re(u, '^https://standardebooks.org/ebooks/(.*)$', '\1');