docstr: True if the state is within [] brackets
code: def get_in_brackets(self):
      """True if the state is within [] brackets"""
      return self.__in_brackets
  
imports: import re
  import wx
  import wx.stc
label_desc: Use image node_id 6 for calling the RegexpState obj's underlying member method code with example usage: obj.get_in_brackets() and returns: self