Regex Tester & Validator

This regular expression validates a string to ensure it consists of exactly one alphabetic character (either uppercase or lowercase) followed by exactly four numeric digits. It is specifically tailored to match the format of Healthcare Common Procedure Coding System (HCPCS) Level II codes. You can use this pattern in medical billing software or patient forms to verify that user input correctly follows the standard 5-character HCPCS code structure before submission.