iphone - The correct NSPredicate format for one-to-many relationship in Core Data -

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I have another object model A and B with one-to-many relationship.

Special task for this, I want to get all the items which a relationship is to B with a property matches "string".

I had tried @ "all bObjects.bProperty match 'string'" , and in that one objc_exception_throw reason: 

  [NSSQLGenerator generSQLStatementForFetchRequest: ignoreInheritance: countOnly:]

What seems to be a problem?

Can anyone advise me on the right format format? You do not use the MATCHES operator when getting core data from SQL Stores

"itemprop =" text ">

text after

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