REGEXP_FILE
  RegExpPatternImpl: <(|\$.*)\.class>
    RegExpBranchImpl: <(|\$.*)\.class>
      RegExpGroupImpl: <(|\$.*)>
        PsiElement(GROUP_BEGIN)('(')
        RegExpPatternImpl: <|\$.*>
          RegExpBranchImpl: <>
            <empty list>
          PsiElement(UNION)('|')
          RegExpBranchImpl: <\$.*>
            RegExpCharImpl: <\$>
              PsiElement(ESC_CHARACTER)('\$')
            RegExpClosureImpl: <.*>
              RegExpSimpleClassImpl: <.>
                PsiElement(DOT)('.')
              RegExpQuantifierImpl: <*>
                PsiElement(STAR)('*')
        PsiElement(GROUP_END)(')')
      RegExpCharImpl: <\.>
        PsiElement(ESC_CHARACTER)('\.')
      RegExpCharImpl: <c>
        PsiElement(CHARACTER)('c')
      RegExpCharImpl: <l>
        PsiElement(CHARACTER)('l')
      RegExpCharImpl: <a>
        PsiElement(CHARACTER)('a')
      RegExpCharImpl: <s>
        PsiElement(CHARACTER)('s')
      RegExpCharImpl: <s>
        PsiElement(CHARACTER)('s')