<human>:  check string match without letter case.
<bot>: Here is a Python program to check string match without letter case

import re

def check_string_match(str1, str2):
  """Check string match without letter case"""
  if str1 == str2:
    return True
  else:
    return False

# Enter the string
string1 = "octopus"

# Enter the string
string2 = "octopus"

# Calling the function
print((check_string_match(string1, string2)))

#Example Output
# True

#Remember to inspect code for bugs.