DATA EXTRACTION GUIDE · 7 MIN READ

How to extract numbers from text without losing context

Number extraction creates a quick working list from invoices, logs and reports. The output is not self-explanatory: once a value is separated from its label, unit and row, its business meaning can become ambiguous.

Define the numeric formats

Decide whether signs, decimals and thousands separators should match. A comma can group thousands in one locale and mark decimals in another, so the source language and format must remain part of the review.

Keep a source reference

Retain the original line or record beside important values. The number 12 might mean a quantity, percentage, month or identifier. Extraction recognises shape, not meaning.

Normalise only for a known calculation

Remove grouping separators and convert decimal notation only after the locale is known. Validate totals and ranges before sending the result into a percentage or statistics calculation.

Worked example

From 'Balance -42.50; limit 1,000; term 12 months', extraction returns three candidates. Their labels must remain available before calculation.

Limitations to review

• Currency symbols and units are not included.
• Dates and identifiers may be matched.
• Locale-specific separators are ambiguous.