
    Create a validation function for the social media platform's content tagging system that determines if user-generated tags follow the required format of lowercase letters connected by underscores. The function should return true only if the input tag follows this strict formatting rule (e.g., "breaking_news" is valid, while "Breaking_News" or "breaking-news" are invalid), helping maintain consistency in content categorization across the platform.
    

    
import re

def text_lowercase_underscore(text):
    """
    Create a validation function for the social media platform's content tagging system that determines if user-generated tags follow the required format of lowercase letters connected by underscores. The function should return true only if the input tag follows this strict formatting rule (e.g., "breaking_news" is valid, while "Breaking_News" or "breaking-news" are invalid), helping maintain consistency in content categorization across the platform.
    

    """
import re

def text_lowercase_underscore(text):
    """
    Create a validation function for the social media platform's content tagging system that determines if user-generated tags follow the required format of lowercase letters connected by underscores. The function should return true only if the input tag follows this strict formatting rule (e.g., "breaking_news" is valid, while "Breaking_News" or "breaking-news" are invalid), helping maintain consistency in content categorization across the platform.
    

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