Dealing with commas in a CSV file

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There’s actually a spec for CSV format, RFC 4180 and how to handle commas:

Fields containing line breaks (CRLF), double quotes, and commas should be enclosed in double-quotes.

http://tools.ietf.org/html/rfc4180

So, to have values foo and bar,baz, you do this:

foo,"bar,baz"

Another important requirement to consider (also from the spec):

If double-quotes are used to enclose fields, then a double-quote
appearing inside a field must be escaped by preceding it with
another double quote. For example:

"aaa","b""bb","ccc"

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