CSV With Commas and Quotes: Escaping and RFC 4180
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. --- The Core Problem CSV uses comma as a delimiter. When a value contains a comma, the parser can't tell where the field ends: Without quoting, would parse as two fields: and . The solution specified by RFC 4180 is to wrap such fields in double quotes. --- RFC 4180 Quoting Rules RFC 4180 defines these rules for quoting: Rule 1:…
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