REGEXP_FILE
  RegExpPatternImpl: <[a-\Qz\E]>
    RegExpBranchImpl: <[a-\Qz\E]>
      RegExpClassImpl: <[a-\Qz\E]>
        PsiElement(CLASS_BEGIN)('[')
        RegExpCharRangeImpl: <a-\Qz>
          RegExpCharImpl: <a>
            PsiElement(CHARACTER)('a')
          PsiElement(MINUS)('-')
          PsiWhiteSpace('\Q')
          RegExpCharImpl: <z>
            PsiElement(CHARACTER)('z')
        PsiWhiteSpace('\E')
        PsiElement(CLASS_END)(']')