Regex Tester & Validator

Matches lines containing exactly two digits, anchored at start and end. Ideal for validating fixed two-digit numeric codes such as medical billing Place of Service (POS) codes (e.g., 11=Office, 21=Inpatient Hospital) on CMS-1500/UB-04 claims. The multiline flag applies the check to each line individually, while global matching finds all occurrences. Commonly used in healthcare claim validation, EDI 837 transactions, and form field input checks.