REGEXP_FILE
  RegExpPatternImpl: <[:^xdigit:]+>
    RegExpBranchImpl: <[:^xdigit:]+>
      RegExpClosureImpl: <[:^xdigit:]+>
        RegExpClassImpl: <[:^xdigit:]>
          PsiElement(CLASS_BEGIN)('[')
          RegExpCharImpl: <:>
            PsiElement(CHARACTER)(':')
          RegExpCharImpl: <^>
            PsiElement(CHARACTER)('^')
          RegExpCharImpl: <x>
            PsiElement(CHARACTER)('x')
          RegExpCharImpl: <d>
            PsiElement(CHARACTER)('d')
          RegExpCharImpl: <i>
            PsiElement(CHARACTER)('i')
          RegExpCharImpl: <g>
            PsiElement(CHARACTER)('g')
          RegExpCharImpl: <i>
            PsiElement(CHARACTER)('i')
          RegExpCharImpl: <t>
            PsiElement(CHARACTER)('t')
          RegExpCharImpl: <:>
            PsiElement(CHARACTER)(':')
          PsiElement(CLASS_END)(']')
        RegExpQuantifierImpl: <+>
          PsiElement(PLUS)('+')