Test, validate and match regular expressions
Extracts flat/unit numbers from Hindi and Marathi (Devanagari) address text. It matches 'सदनिका' (unit) followed by 'नं' (no.), or 'फ्लॅट'/'फ्लॅट' (flat) followed by variants like 'नंबर' (number), 'नं', or 'क्र.' (serial no.), then captures the trailing digits. Useful for parsing addresses in utility bills, property records, and OCR output from Indian documents.