REGEXP_FILE
  RegExpPatternImpl: <[\udbff\udfff-\ud800\udc00]>
    RegExpBranchImpl: <[\udbff\udfff-\ud800\udc00]>
      RegExpClassImpl: <[\udbff\udfff-\ud800\udc00]>
        PsiElement(CLASS_BEGIN)('[')
        RegExpCharRangeImpl: <\udbff\udfff-\ud800\udc00>
          RegExpCharImpl: <\udbff\udfff>
            PsiElement(UNICODE_CHAR)('\udbff')
            PsiElement(UNICODE_CHAR)('\udfff')
          PsiElement(MINUS)('-')
          RegExpCharImpl: <\ud800\udc00>
            PsiElement(UNICODE_CHAR)('\ud800')
            PsiElement(UNICODE_CHAR)('\udc00')
        PsiElement(CLASS_END)(']')