Ask help for polynomial regression with nature language

I was using polynomial regression to find the relationship and the contribution for classes or numbers for results for a long time and it is running well.
For example, we have the news review numbers as the result, and we can find if "tags", "total word numbers", "writers", "news picture numbers " are correlative for the result.
But there's a much more important variable for the result, it's the title. The title of the news. But there's one thing I have no idea how to do. The title is the nature language, how should I do for it?

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