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I have an encoding question and would like to ask for help. I notice if I choose “UTF-8” as encoding, there are (at least) two double quotes " and “. But when I choose “ISO-8859-1” as the encoding, I see the latter double quote becomes ¡°, or sometimes for example “.
Could anyone please explain why this is the case? How can match “ and replace it with " using regexp in perl?
Thanks a lot.
ISO-8859-1 is a one-byte-per-character encoding. The fancy Unicode double-quotes are not in the ISO-8859-1 character set. So what you are seeing is a multi-byte character represented as a sequence of ISO-8859-1 bytes.
To match these weird things, see the perlunicode man page, especially the \x{…} and \N{…} escape sequences.
To answer your question, try \x{201C} to match the Unicode LEFT DOUBLE QUOTATION MARK and \x{201D} to match the RIGHT DOUBLE QUOTATION MARK. You missed the latter in your question :-).
[update]
I should have provided my reference… Some nice gentleman in the UK has a page on ASCII and Unicode quotation marks. The plain vanilla ASCII/ISO-8859-1 double-quote is just called QUOTATION MARK.