Regex Editor & Tester

This regular expression is designed to validate or extract specific key-value pairs from a JSON-like string, specifically matching a "UserID" containing uppercase alphanumeric characters or a "CountryCode" containing only uppercase letters. It allows for optional whitespace between the key and value, making it robust against minor formatting inconsistencies. Using global and multiline flags, it can efficiently scan an entire document to find all valid employee portal entries.