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