CSV With Commas and Quotes: Escaping, RFC 4180, and Real-World Fixes
Handle commas inside fields, double-quoted strings, and escaped quotes in CSV. Understand RFC 4180 rules and common parser deviations.
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Tags: data, csv, parsing
CSV With Commas and Quotes: Escaping, RFC 4180, and Real-World Fixes The comma is both the defining character of CSV and its biggest problem. The moment a value contains a comma — a city name, an address, a description — the naive parsing approach breaks. Add quoted fields, escaped quotes, or newlines inside values and the complexity compounds. This guide explains exactly how RFC 4180 handles these cases, why real-world CSVs deviate, and how to fix broken files. RFC 4180 Quoting Rules RFC 4180 defines these rules for quoting: Rule 1: Any field may optionally be enclosed in double quotes. Rule 2: If a field contains commas, double-quotes, or newlines, it must be enclosed in double quotes. Rule 3: A double-quote inside a quoted field is escaped by doubling it: Parses to: Rule 4: Whitespace…
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