REGEXP_FILE
  RegExpPatternImpl: <a([bc]*)c*>
    RegExpBranchImpl: <a([bc]*)c*>
      RegExpCharImpl: <a>
        PsiElement(CHARACTER)('a')
      RegExpGroupImpl: <([bc]*)>
        PsiElement(GROUP_BEGIN)('(')
        RegExpPatternImpl: <[bc]*>
          RegExpBranchImpl: <[bc]*>
            RegExpClosureImpl: <[bc]*>
              RegExpClassImpl: <[bc]>
                PsiElement(CLASS_BEGIN)('[')
                RegExpCharImpl: <b>
                  PsiElement(CHARACTER)('b')
                RegExpCharImpl: <c>
                  PsiElement(CHARACTER)('c')
                PsiElement(CLASS_END)(']')
              RegExpQuantifierImpl: <*>
                PsiElement(STAR)('*')
        PsiElement(GROUP_END)(')')
      RegExpClosureImpl: <c*>
        RegExpCharImpl: <c>
          PsiElement(CHARACTER)('c')
        RegExpQuantifierImpl: <*>
          PsiElement(STAR)('*')