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replace

Performs string replacement in specified fields. Supports simple string replacement and regex-based replacement.

Write with --output. A trailing path is not a positional argument.

# Simple string replacement
undatum replace data.csv --field name --pattern "Mr\." --replacement "Mr" --output output.csv

# Regex replacement
undatum replace data.jsonl --field email --pattern "@old.com" --replacement "@new.com" --regex --output output.jsonl

# Global replacement (all occurrences; default is first match only)
undatum replace data.csv --field text --pattern "old" --replacement "new" --global-replace --output output.csv

Key options:

  • --field, --pattern, --replacement
  • --regex — treat --pattern as regex
  • --global-replace — replace every match in the field (not --global)
  • --output — output path (stdout if omitted)

Also accepts --table, --flatten-nested, --on-error, --error-log, and --quotechar (shared options).