
    Write a function that validates transaction identifiers in the bank's monitoring system by checking if they follow the required format of lowercase letters connected by underscores. The function should return true if the transaction ID matches this format (like "swift_transfer_domestic") and false otherwise, helping maintain consistent transaction categorization and security tracking.
    

    
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates transaction identifiers in the bank's monitoring system by checking if they follow the required format of lowercase letters connected by underscores. The function should return true if the transaction ID matches this format (like "swift_transfer_domestic") and false otherwise, helping maintain consistent transaction categorization and security tracking.
    

    """
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates transaction identifiers in the bank's monitoring system by checking if they follow the required format of lowercase letters connected by underscores. The function should return true if the transaction ID matches this format (like "swift_transfer_domestic") and false otherwise, helping maintain consistent transaction categorization and security tracking.
    

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