This question from March 2020 points out that many questions/answers link to papers at the http://front.math.ucdavis.edu/ frontend instead of at the arXiv itself, but that the frontend had been down a few weeks. There are c.600 affected questions and it looks like a large proportion of the links could be fixed by a simple search-and-replace; so comments and the well-received answer suggested asking SE employees to do such a search-and-replace fix (moderators don’t have that ability), but felt “down for a few weeks” was too soon.

The frontend has now been down for 17 months; presumably this is no longer too soon. **Can moderators now petition SE for a search-and-replace fix? Or if that’s too administratively difficult, should we just fix the links by hand, trying not to bump too many at once as usual?**

Useful search queries, copied from the older question:

Search-and-replace suggestion: The links fall into several groups, some that should be easy to recognise and fix by regex, others less clear. Hopefully a large proportion can be fixed by regex, leaving the rest to fix by hand.

For links to preprints after April 2007, the correspondence is straightforward — we want to replace a url like `http://front.math.ucdavis.edu/0809.1179`

with `https://arxiv.org/abs/0809.1179`

, and the first four digits represent `YYMM`

. So a regex replacing `https?://front.math.ucdavis.edu/([12]|0[8-9]|071|070[4-9])`

with `https://arxiv.org/abs/\1`

should recognise and fix these links, I think. (Details depend on the regex flavour used, of course.)

Links to older preprints are less consistent. Some have the form `https://front.math.ucdavis.edu/math.LO/9909115`

, and these should be easy again: the identifier part agrees with the arXiv’s, so a regex replace of `https?://front.math.ucdavis.edu/(math[.a-zA-Z]*/\d+)`

by `https://arxiv.org/abs/\1`

should recognised and fix these. But others use a different identifier, whose correspondence with the arXiv’s identifiers seems unclear — e.g. `http://front.math.ucdavis.edu/0310.5109`

corresponds to `https://arxiv.org/abs/math/0310109`

(and `https://arxiv.org/abs/0310.5109`

doesn’t work). Does anyone else know or see how the correspondence works for these?

Finally there are links to category searches, and the like, which I don’t think we can hope to fix by regex. This edit history has examples of all three kinds.

`https://front.math.ucdavis.edu/math.LO/9909115`

. $\endgroup$`math.LO`

agrees with the arXiv, so we just need to change the url prefix — but it would take a little thought to write a regex that’ll recognise url’s of that form without false positives. $\endgroup$`***.51** = dg-ga`

? $\endgroup$1more comment