
    Develop a function to validate user interest tags in the event recommendation system by checking if they strictly follow the lowercase-underscore format (e.g., "outdoor_hiking"). The function should return true only if the tag consists of lowercase letters connected by underscores, and false for any other format, ensuring consistent interest categorization across the platform.
    

    
import re

def text_lowercase_underscore(text):
    """
    Develop a function to validate user interest tags in the event recommendation system by checking if they strictly follow the lowercase-underscore format (e.g., "outdoor_hiking"). The function should return true only if the tag consists of lowercase letters connected by underscores, and false for any other format, ensuring consistent interest categorization across the platform.
    

    """
import re

def text_lowercase_underscore(text):
    """
    Develop a function to validate user interest tags in the event recommendation system by checking if they strictly follow the lowercase-underscore format (e.g., "outdoor_hiking"). The function should return true only if the tag consists of lowercase letters connected by underscores, and false for any other format, ensuring consistent interest categorization across the platform.
    

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