
    Write a function that validates emergency room admission codes by checking if the department identifier is followed by either two or three severity level indicators, ensuring proper patient prioritization in the triage system. The department identifier is represented by 'a' and severity indicators are represented by 'b' in the admission code string.
    

    
import re

def text_match_two_three(text):
    """
    Write a function that validates emergency room admission codes by checking if the department identifier is followed by either two or three severity level indicators, ensuring proper patient prioritization in the triage system. The department identifier is represented by 'a' and severity indicators are represented by 'b' in the admission code string.
    

    """
import re

def text_match_two_three(text):
    """
    Write a function that validates emergency room admission codes by checking if the department identifier is followed by either two or three severity level indicators, ensuring proper patient prioritization in the triage system. The department identifier is represented by 'a' and severity indicators are represented by 'b' in the admission code string.
    

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