TDT4109/Exercise 7/12.py

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2020-10-20 22:58:37 +02:00
import re
def find_substring_indexes(str1, str2):
matches = re.compile(f'(?=({str1}))', re.IGNORECASE).finditer(str2)
return [match.span()[0] for match in matches]
def sub_string_matches(str1, str2, str3):
matchIndexes = find_substring_indexes(str1, str2)
offset = 0
newString = str2
for i in range(len(matchIndexes)):
realIndex = matchIndexes[i] + offset
try:
if len(str3) - len(str1) - (matchIndexes[i+1] - matchIndexes[i]) > 0:
reverseOffset = len(str3) - len(str1) - (matchIndexes[i+1] - matchIndexes[i])
else:
reverseOffset = 0
except IndexError:
reverseOffset = 0
pass
newString = newString[:realIndex] + str3 + newString[realIndex + len(str1) - reverseOffset:]
offset += len(str3) - len(str1) + reverseOffset
return newString
if __name__ == "__main__":
print(find_substring_indexes('iS', "Is this the real life? Is this just fantasy?"))
print(find_substring_indexes(str1 = "oo", str2 = "Never let you go let me go. Never let me go ooo"))
print(sub_string_matches(str1 = "iS", str2 = "Is this the real life? Is this just fantasy?", str3 = "cool"))
print(sub_string_matches(str1 = "oo", str2 = "Never let you goooo let me goo. Never let me goo oooo", str3 = "cool"))