REGEXP_FILE
  RegExpPatternImpl: <a[b-d]e>
    RegExpBranchImpl: <a[b-d]e>
      RegExpCharImpl: <a>
        PsiElement(CHARACTER)('a')
      RegExpClassImpl: <[b-d]>
        PsiElement(CLASS_BEGIN)('[')
        RegExpCharRangeImpl: <b-d>
          RegExpCharImpl: <b>
            PsiElement(CHARACTER)('b')
          PsiElement(MINUS)('-')
          RegExpCharImpl: <d>
            PsiElement(CHARACTER)('d')
        PsiElement(CLASS_END)(']')
      RegExpCharImpl: <e>
        PsiElement(CHARACTER)('e')