
    Write a function that checks whether a professional's bio contains the certification pattern where a base credential ('a') is followed by either two or three specialization endorsements ('b'), which indicates a validated expert status in the networking platform.
    

    
import re

def text_match_two_three(text):
    """
    Write a function that checks whether a professional's bio contains the certification pattern where a base credential ('a') is followed by either two or three specialization endorsements ('b'), which indicates a validated expert status in the networking platform.
    

    """
import re

def text_match_two_three(text):
    """
    Write a function that checks whether a professional's bio contains the certification pattern where a base credential ('a') is followed by either two or three specialization endorsements ('b'), which indicates a validated expert status in the networking platform.
    

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