Lookup Table didn't work for RegexEntityExtractor

Hi Rasa Community,

I use lookup table full of uppercase words for RegexEntityExtractor, in the doc NLU Training Data it is said that lookup table is case insensitive. However after cross validation, it turns out that my RegexEntityExtractor is not able to identify all those entities in lowercase. It seems that the lookup table is case sensitive? I’ve defined couple of training examples for the entities in lookup table and set case_sensitive of RegexFeaturizer to False.

This problem really confused me for a while, can someone help me to solve this?

This is how my pipeline looks like:

language: de

pipeline:
   - name: WhitespaceTokenizer
   - name: RegexFeaturizer
     case_sensitive: False
   - name: RegexEntityExtractor
     case_sensitive: False
   - name: LexicalSyntacticFeaturizer
   - name: CountVectorsFeaturizer
   - name: CountVectorsFeaturizer
     analyzer: char_wb
     min_ngram: 1
     max_ngram: 4
   - name: "DucklingEntityExtractor"
     url: "http://localhost:8000"
     dimensions: ["time", "number", "amount-of-money"]
     locale: "de_DE"
     timezone: "Europe/Berlin"
   - name: "CRFEntityExtractor"
   - name: DIETClassifier
     epochs: 100
   - name: EntitySynonymMapper
   - name: ResponseSelector
     epochs: 100
   - name: FallbackClassifier
     threshold: 0.75
     ambiguity_threshold: 0.1

thanks and regards