
    Write a function that validates whether a delivery route code contains a central hub identifier ('a') followed by either a standard delivery zone ('bb') or an extended zone ('bbb') to ensure proper route pattern compliance in the fleet management system.
    

    
import re

def text_match_two_three(text):
    """
    Write a function that validates whether a delivery route code contains a central hub identifier ('a') followed by either a standard delivery zone ('bb') or an extended zone ('bbb') to ensure proper route pattern compliance in the fleet management system.
    

    """
import re

def text_match_two_three(text):
    """
    Write a function that validates whether a delivery route code contains a central hub identifier ('a') followed by either a standard delivery zone ('bb') or an extended zone ('bbb') to ensure proper route pattern compliance in the fleet management system.
    

    """
    patterns = 'ab{2,3}'
    if re.search(patterns, text):
        return True
    else:
        return False