# Write a function to find
# sequences of lowercase letters joined with a underscore.
# Example:
#    "aab_cbbbc" the function returns "Found a match!"
#    "aab_Abbbc" the function returns "Not matched!"
#    "Aaab_abbbc" the function returns "Not matched!"

import re

def text_match1(text):
    regex = re.compile(r'(^[a-z]+_[a-z]+$)')
    if regex.search(text):
        return 'Found a match!'
    else:
        return 'Not matched!'

print(text_match1("aab_cbbbc"))
print(text_match1("aab_Abbbc"))
print(text_match1("Aaab_abbbc"))



def text_match2(text):
    regex = re.compile(r'(^[a-z]+_[a-z]+$)')
    if len(regex.findall(text)) > 0:
        return 'Found a match!'
    else:
        return 'Not matched!'

print(text_match2("aab_cbbbc"))
print(text_match2("aab_Abbbc"))
print(text_match2("Aaab_abbbc"))



def text_match3(text):
    patterns = '^[a-z]+_[a-z]+$'
    if re.search(patterns, text):
        return 'Found a match!'
    else:
        return 'Not matched!'

print(text_match3("aab_cbbbc"))
print(text_match3("aab_Abbbc"))
print(text_match3("Aaab_abbbc"))