The character ² is not a valid search character. On Electrical Engineering, one common term is I²C, sometimes (correctly) spelled as I²C (IIC or I-squared-C). A search for I²C does not throw an error, nor does it return anything with I²C. Instead it results in questions and answers including IC, an unrelated term. And the automatic URL recognition does not work when ² is in the URL.
For example https://electronics.stackexchange.com/questions/203076/i²c-bit-banging
Notice how it hyperlinks I²C bit banging to https://electronics.stackexchange.com/questions/203076/i, while dropping ²c-bit-banging?
Sometime between writing this bug report and 2022, the automatic URL recognition no longer tries to fix the URL. After editing the question, the broken renaming went away, so just the link shows. The rest still doesn't work properly.
Notably, ² is valid in a URL, so it will bring up the correct question if copied and pasted, or hyperlinked, but not in the search or URL parsing.
Can this be fixed by the code review team? This is a valid Unicode utf-8 character Superscript 2 hex 0x00B2
If anything, can a search for, and results for, ² be mapped to 2?
This is not a duplicate of that question, because this does not work, while that was fixed. So this is a new issue.
