Improvement : [Vision Text API] provide pattern to filter detected Text Blocks

[Tindaro85]

Is it possibile to provide a pattern ( regex ) to filter detected text in TextRecognizer ( or implementing a new Detector ) ?
I already do this in my Processor ( that extends Detector.Processor) but I wonder if it's the best way to do it ( even in term of performances ).
Is there a way to filter out texts before they arrive to Processor?