This is a **regular expression (regex)** that matches specific strings...

This is a regular expression (regex) that matches specific strings based on the following rules:

Breakdown:

1. ^: Asserts the start of the string.
2. (?!...): This is a negative lookahead. It ensures that what follows does not match the pattern inside it.
3. .*: Matches any number of characters (including zero characters).
4. (?:...): This is a non-capturing group, used to group patterns without creating a capturing group.
5. Config|Convert|Keep|Report|Test|Update: A list of substrings (joined with the | OR operator). The regex ensures none of these words are present in the string.
6. .*: Matches the remaining part of the string.

Overall Explanation:

This regex is used to match a string that does NOT contain any of the following words: Config, Convert, Keep, Report, Test, or Update.

Examples:

• "ExampleString" → Matches (does not contain any of the forbidden words).
• "KeepConfig" → Does Not Match (contains Config).
• "Test something new" → Does Not Match (contains Test).
• "Welcome to Regex" → Matches (none of the forbidden words are present).

In summary, this code is often used as a filter to exclude strings containing certain keywords.