REGEX

This example demonstrates how to use the REGEX keyword in template filters for regular expression matching. The REGEX keyword supports: - **Basic pattern matching**: Match field values against regex patterns (e.g., `REGEX "^Laptop"`) - **Character classes**: Use `\d`, `\w`, `\s` and other regex character classes directly - **Anchors**: Use `^` and `$` for full-string matching - **Alternation and groups**: Use `(Laptop|Phone)` to match multiple patterns - **Combining with NOT/AND/OR**: Combine REGEX with other filter conditions - **Case-insensitive matching**: Use inline flag `(?i)` for case-insensitive patterns