I need help with an assignment.

So I need to make a program where I can search for a word in a text file but all I can get is a word search. I can't figure out how to make it search for a word containing the input string and I can't get the output right either, this is what I have so far:<br><br>```python<br>import re<br><br>def find_words(filename, input_str):<br> file = open(filename, "r")<br><br> for line in file:<br> linecustomize = re.findall(r'\b\w+\b', line)<br> for word in linecustomize:<br> if re.match(word, input_str):<br> print(f"{word} is found in the {filename} file.")<br><br> file.close()<br><br><br>filename = "file.txt"<br>input_str = input("Enter word to search file for: ")<br>find_words(filename, input_str)<br>```<br><br>It's still really new to me but the good news is that it runs without errors, the bad news is that it just prints a blank line when I run it, which means I've made a mistake somewhere. I want it to run through the text file and print all the words containing the input string. I've passed tutorials for beginners and I'm currently working on an assignment.