# Trace through the code by hand.
# Write down all the statements that will be printed on the screen.
#
# Consider the difference and similarity when using match(), search(), and findall()

# find
# finditer
# findall
# search
# match
# ????


import re

def match_occurrence(string, regex):
    # What does match(string) do?
    # What does it return?

    result = []
    number_occurrence = 0

    print('\n' + "=== match_occurrence ===")

    match_objects = regex.match(string)
    if match_objects:
        print("match_objects = " + match_objects.group())
        for occurrence in match_objects.group().split():
            number_occurrence = number_occurrence + 1
            result.append(occurrence)

    return result, number_occurrence



def search_occurrence(string, regex):
    # What does search(string) do?
    # What does it return?

    result = []
    number_occurrence = 0

    print('\n' + "=== search_occurrence ===")

    search_objects = regex.search(string)
    if search_objects:
        print("search_objects = " + search_objects.group())
        for occurrence in search_objects.group().split():
            number_occurrence = number_occurrence + 1
            result.append(occurrence)

    return result, number_occurrence



def findall_occurrence(string, regex):
    # What does findall(string) do?
    # What does it return?

    result = []
    number_occurrence = 0

    print('\n' + "=== find_occurrence ===")

    find_objects = regex.findall(string)
    if find_objects:
        print("find_objects = " + str(find_objects))
        for occurrence in find_objects:
            number_occurrence = number_occurrence + 1
        result = find_objects

    return result, number_occurrence




input_string = "A few small syntax errors is OK. But if you are really off we will take off points. " \
               "Try to write correct code."
regex = re.compile(r'(.f{2})')    # what does this regular expression describe?

print(match_occurrence(input_string, regex))
print(search_occurrence(input_string, regex))
print(findall_occurrence(input_string, regex))


# note:
# find() is a string processing function
# findall() is a regular expression function