code: def __init__(self, s):
      self.s = s
      self.i = -1
      self.end = 0
      self.next()
  
file_path: catboost/contrib/tools/cython/Cython/Plex/Traditional.py
imports: from __future__ import absolute_import
  from .Regexps import Alt, Seq, Rep, Rep1, Opt, Any, AnyBut, Bol, Eol, Char
  from .Errors import PlexError
label_desc: Use image node_id 1 to create a new REParser object from inherited base classes: object with example: obj = REParser(s)