
    Write a function that validates whether a parking zone identifier follows the correct format by checking if it consists of lowercase letters joined with underscores. The function should return true if the zone identifier matches this format (like "north_zone" or "premium_spot_a") and false otherwise.
    

    
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates whether a parking zone identifier follows the correct format by checking if it consists of lowercase letters joined with underscores. The function should return true if the zone identifier matches this format (like "north_zone" or "premium_spot_a") and false otherwise.
    

    """
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates whether a parking zone identifier follows the correct format by checking if it consists of lowercase letters joined with underscores. The function should return true if the zone identifier matches this format (like "north_zone" or "premium_spot_a") and false otherwise.
    

    """
    patterns = '^[a-z]+_[a-z]+$'
    if re.search(patterns, text):
        return True
    else:
        return False