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====== Option +quote_char+
Specifies the character (\String of length 1) used used to quote fields
in both parsing and generating.
This String will be transcoded into the data's \Encoding before use.
Default value:
CSV::DEFAULT_OPTIONS.fetch(:quote_char) # => "\"" (backslash)
This is useful for an application that incorrectly uses <tt>'</tt> (single-quote)
to quote fields, instead of the correct <tt>"</tt> (double-quote).
Using the default:
ary = ['a', 'b', '"c"', 'd']
str = CSV.generate_line(ary)
str # => "a,b,\"\"\"c\"\"\",d\n"
ary = CSV.parse_line(str)
ary # => ["a", "b", "\"c\"", "d"]
Using <tt>'</tt> (single-quote):
quote_char = "'"
ary = ['a', 'b', '\'c\'', 'd']
str = CSV.generate_line(ary, quote_char: quote_char)
str # => "a,b,'''c''',d\n"
ary = CSV.parse_line(str, quote_char: quote_char)
ary # => [["a", "b", "'c'", "d"]]
---
Raises an exception if the \String length is greater than 1:
# Raises ArgumentError (:quote_char has to be nil or a single character String)
CSV.new('', quote_char: 'xx')
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