
    Write a function that validates user-generated event hashtags in a social networking platform, ensuring they follow the platform's standard format of lowercase letters connected by underscores (e.g., "outdoor_hiking"). The function should return true if the hashtag follows this format and false otherwise.
    

    
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates user-generated event hashtags in a social networking platform, ensuring they follow the platform's standard format of lowercase letters connected by underscores (e.g., "outdoor_hiking"). The function should return true if the hashtag follows this format and false otherwise.
    

    """
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates user-generated event hashtags in a social networking platform, ensuring they follow the platform's standard format of lowercase letters connected by underscores (e.g., "outdoor_hiking"). The function should return true if the hashtag follows this format and false otherwise.
    

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