docstr: Try running the filter on a test string
docstr_tok: ["Try","running","the","filter","on","a","test","string"]
code: def test_valid(self, pipeline, *args):
      """Try running the filter on a test string"""
      self("", *args)
  
imports: import re
label_desc: Use image node_id 3 for calling the FilterPredicate obj's underlying member method code with example usage: obj.test_valid(pipeline) without return types