REGEXP_FILE
  RegExpPatternImpl: <a{1}>
    RegExpBranchImpl: <a{1}>
      RegExpClosureImpl: <a{1}>
        RegExpCharImpl: <a>
          PsiElement(CHARACTER)('a')
        RegExpQuantifierImpl: <{1}>
          PsiElement(LBRACE)('{')
          RegExpNumberImpl: <1>
            PsiElement(NUMBER)('1')
          PsiElement(RBRACE)('}')