
    Develop a route validation function for a delivery fleet management system that verifies if a route code starts with a depot identifier ('a') followed by one or more sequential delivery stops ('b'). The function must ensure that each valid route begins from a designated depot and includes at least one delivery point.
    

    
import re

def text_match_one(text):
    """
    Develop a route validation function for a delivery fleet management system that verifies if a route code starts with a depot identifier ('a') followed by one or more sequential delivery stops ('b'). The function must ensure that each valid route begins from a designated depot and includes at least one delivery point.
    

    """
import re

def text_match_one(text):
    """
    Develop a route validation function for a delivery fleet management system that verifies if a route code starts with a depot identifier ('a') followed by one or more sequential delivery stops ('b'). The function must ensure that each valid route begins from a designated depot and includes at least one delivery point.
    

    """
    patterns = 'ab+?'
    if re.search(patterns, text):
        return True
    else:
        return False