code: def test_matches_symbols(self):
      self.assertMatch("foo", "_")
      self.assertNoMatch("foo()", "_")
      self.assertMatch("foo + bar", "foo + _")
      self.assertNoMatch("bar + bar", "foo + _")
      self.assertNoMatch("foo - bar", "foo + _")
  
imports: import ast
  import collections
  import textwrap
  import unittest
  import gast
  from nvidia.dali._autograph.pyct import anno
  from nvidia.dali._autograph.pyct import ast_util
  from nvidia.dali._autograph.pyct import loader
  from nvidia.dali._autograph.pyct import parser
  from nvidia.dali._autograph.pyct import pretty_printer
  from nvidia.dali._autograph.pyct import qual_names
label_desc: Use image node_id 14 for calling the AstUtilTest obj's underlying member method code with example usage: obj.test_matches_symbols() without return types