REGEXP_FILE
  RegExpPatternImpl: <(?>atomic)>
    RegExpBranchImpl: <(?>atomic)>
      RegExpGroupImpl: <(?>atomic)>
        PsiElement(ATOMIC_GROUP)('(?>')
        RegExpPatternImpl: <atomic>
          RegExpBranchImpl: <atomic>
            RegExpCharImpl: <a>
              PsiElement(CHARACTER)('a')
            RegExpCharImpl: <t>
              PsiElement(CHARACTER)('t')
            RegExpCharImpl: <o>
              PsiElement(CHARACTER)('o')
            RegExpCharImpl: <m>
              PsiElement(CHARACTER)('m')
            RegExpCharImpl: <i>
              PsiElement(CHARACTER)('i')
            RegExpCharImpl: <c>
              PsiElement(CHARACTER)('c')
        PsiElement(GROUP_END)(')')