How to search a string for different tenses?

I can use Stemmers, Filters etc. No problem.

But what about this case, for 开发者_如何学编程example the source text contains the phrase:

The fox made a jump.

User has entered: fox AND make Results = 0;

The question is how to process irregular forms of words?

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There aren't that many irregular verbs. Get a list of the most common ones like here and use it to do a find/replace in your query string to replace "make" with ("make" OR "made") before submitting.