Regex Tester & Validator

This regex matches lines that start with one of a specific list of uppercase alphanumeric codes, such as ACD, CO2, or VNT. The codes appear to be abbreviations for fluids, systems, or materials, likely used in engineering, industrial, or data processing contexts like the Duqm fluid codes. Using the global and multiline flags, it effectively identifies and categorizes these codes at the beginning of each line in a document.