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Differences from FilenameRegexMetExtractor:

1. Assigns ProductType. FilenameRegexMetExtractor runs after ProductType is already determined.
2. Runs on the client-side (crawler). FilenameRegexMetExtractor runs on the server-side (filemgr).
3. Different patterns for different ProductTypes. FilenameRegexMetExtractor config applies the same pattern to all files.

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