This PR is stale because it has been open for 30 days with no activity.

ptokarski has signed CLA, but piotr-profound has not.

This PR is stale because it has been open for 30 days with no activity.

This PR is stale because it has been open for 30 days with no activity.

Thank you for the patch, and sorry for the long delay.

On the main branch the sniffer was rewritten (gh-83273), so these regular expressions no longer exist there and the sample from the issue is detected correctly now.

For the maintenance branches this change is too risky: a quoted field may legitimately contain a line break, and forbidding that in the pattern loses the evidence for the real delimiter. On 4000 generated samples it changes the guess for 1.4% of them, and in all of those cases the new guess is worse — for example '"multi\nline"\tit\'s\nit\'s\t"multi\nline"\n' is detected as '\t' before the change and as 'l' after it.