
    Write a function that validates loan application identifiers by checking if they follow the required format of lowercase letters connected by underscores, essential for the automated loan processing system. The function should return true if the identifier matches the required pattern (like "credit_score_high") and false otherwise.
    

    
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates loan application identifiers by checking if they follow the required format of lowercase letters connected by underscores, essential for the automated loan processing system. The function should return true if the identifier matches the required pattern (like "credit_score_high") and false otherwise.
    

    """
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates loan application identifiers by checking if they follow the required format of lowercase letters connected by underscores, essential for the automated loan processing system. The function should return true if the identifier matches the required pattern (like "credit_score_high") and false otherwise.
    

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