Does not allow # in names? about spss HOT 4 CLOSED

Ok I will look into a PR. For now I have just created my own Writer class, but of course this can be an issue if the package gets updated down the line :) I can perhaps add a check to ensure that it cannot start with those special as that is not allowed.

I will use this as a guide https://www.ibm.com/docs/en/spss-statistics/28.0.0?topic=SSLVMB_28.0.0/spss/base/syn_variables_variable_names.htm

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The $, #, and @ are special characters if they are written in a specific position, but they can also be used as part of the name if not. I think they are excluded here for simplicity. The reader must read it (otherwise we won't be able to read some files), but nothing forces the writer to allow it, since you can control how the file will be written. So I don't have a firm position on allowing the writer to use it or not. If you want that possibility to be included, please create a PR for that. If it doesn't affect anything else and the resulting file can be read, I don't see why it can't be merged.

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I will also suggest replacing A-Za-z with \w as that should allow any word character (eg. æøå from the danish alphabet)

^(?!#)[\w0-9_\.#\x{4e00}-\x{9fa5}]+$

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Yes is the same, if is tested and we can write special characters without a problem, i don't see why not. This is allowed by the sav file specification. Just take care to not allow the inclusion of $, # in the first position and follow the that rules you linked.

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