
    Write a function that validates investment strategy labels in the portfolio management system by checking if they follow the required format of lowercase letters connected by underscores. The function should return true if the strategy label follows this format (e.g., "high_yield_bonds") and false otherwise.
    

    
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates investment strategy labels in the portfolio management system by checking if they follow the required format of lowercase letters connected by underscores. The function should return true if the strategy label follows this format (e.g., "high_yield_bonds") and false otherwise.
    

    """
import re

def text_lowercase_underscore(text):
    """
    Write a function that validates investment strategy labels in the portfolio management system by checking if they follow the required format of lowercase letters connected by underscores. The function should return true if the strategy label follows this format (e.g., "high_yield_bonds") and false otherwise.
    

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