Hi Eric, This has been my experience as well. I haven't found a way to modify only one field when there are more that one of the same tag in the same record. Are the links you are trying to change all the same domain? Or a couple of different domains? If so, you could match the regex on a longer part of the URL e.g. s/^https://some-online-resource.com/https://proxy.cca.edu/url?=https://some-onl... You can have many options in one modification template, so you can have many "copy and replace" for various resources. Or you can do it by batch. The latter is usually what I've done in the past: make a report to have the URLs matching some-online-resource.com, batch modify those. Then change the modification template, change the report to have the URLs another-online-resource.com and batch modify those records, etc. Good luck! Caroline On 2023-08-04 11:31, Eric Phetteplace wrote:
Hi collective wisdom,
I'm running into a MARC modification template problem and I can't tell if I'm missing something or there's a bug/limitation. I know I could accomplish these edits with MARCEdit or a script, but I was hoping to use Koha's tools.
I have a record with two 856 fields with links, I want to apply our proxy server prefix to one link but not the other. That seems to be impossible; Koha clobbers the second link with a copy of the first. Here's a minimal example.
Record 245 _ _ ‡aExample 856 4 0 ‡uhttps://example.com‡yLink to proxy 856 4 0 ‡uhttps://www.cca.edu‡yLink to retain
MARC modification Copy and replace 1st field(s) 856 u to field 856 u Regex ✅ s/^http/ https://proxy.cca.edu/url?=http/ If field 856 u matches m/https://example.com/ Regex ✅
Output record 245 _aExample 856 40 _uhttps://proxy.cca.edu/url?=https://example.com _yLink to proxy 856 40 _uhttps://proxy.cca.edu/url?=https://example.com _yLink to retain
This happens whether I set the modification template to use the "1st" or "every" 856 field. I don't understand why the second 856 is touched at all, since it does not meet the "if" condition, much less why instead of receiving its own link proxied it gets the first 856 URL proxied.
Based on a few tests, it also seems like the "1st" field with respect to modification actions is not always the one that's visually first when I edit a record. I tried a set of three actions which 1) copied the first field to another, unused field, 2) modified it there, and then 3) copied it back, but Koha copied the second field instead.
Best,
ERIC PHETTEPLACE Systems Librarian, Libraries (he/him)
ephetteplace@cca.edu
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