REGEXP_FILE
  RegExpPatternImpl: <([a-c]+?)c>
    RegExpBranchImpl: <([a-c]+?)c>
      RegExpGroupImpl: <([a-c]+?)>
        PsiElement(GROUP_BEGIN)('(')
        RegExpPatternImpl: <[a-c]+?>
          RegExpBranchImpl: <[a-c]+?>
            RegExpClosureImpl: <[a-c]+?>
              RegExpClassImpl: <[a-c]>
                PsiElement(CLASS_BEGIN)('[')
                RegExpCharRangeImpl: <a-c>
                  RegExpCharImpl: <a>
                    PsiElement(CHARACTER)('a')
                  PsiElement(MINUS)('-')
                  RegExpCharImpl: <c>
                    PsiElement(CHARACTER)('c')
                PsiElement(CLASS_END)(']')
              RegExpQuantifierImpl: <+?>
                PsiElement(PLUS)('+')
                PsiElement(QUEST)('?')
        PsiElement(GROUP_END)(')')
      RegExpCharImpl: <c>
        PsiElement(CHARACTER)('c')