or (C) a single newline or end-of-file character, # double quotes ("), commas (,), or newlines (\n) * # containing any number of characters which are not " # and ending with a double quote character
)* # in any order and any number of times (?: # character, containing any number (0+) of (A) a double quoted string, beginning with a double quote (") ( # single capture group for ease of use CSV can be either. # the end of the previous line, or at a comma To capture strings in double quotes (including commas and escaped double quotes): (?:,|\n|^) # all values must start at the beginning of the file, By treating the escape sequences (in this case, only "") as special groups in regex, we can easily capture double quoted text in CSV. So the only escaped character we need to worry about is the double quote.īecause of this, a string of text will always be delimited by a pair of double quote characters and contain an even number of double quote characters. Microsoft also strips newline characters from data before exporting them to CSV. Note that, although escaping commas with double quotes is RFC 4180 standard, Microsoft doesn't follow this recommendation, instead just surrounding text which contains commas with double quotes. If the string also contains double quote (") characters, they must be escaped with a preceding double quote, so If a desired piece of data, say a string of text, itself contains a comma, then this string must be surrounded by double quotes: Parse Microsoft-style CSV data with regex BackgroundĬSV (comma-separated values) files organise their data by separating them with newlines and commas.
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