[Python] How to search and match and corrent exact word in text file [duplicate]

test.txt file contains 2 misspelled words.

loyai

royai

pain

I want to search for the misspelled words and replace them using dict words_. My problem is if a misspelled word (pai) is part of another word (pain) it corrects pain to paln when it should ignore it.

How can I have my code ignore words that are not a full match to the misspelled word?

#!/usr/bin/env python3
import re

words_ = {"loyai":"loyal", "royai":"royal", "pai":"pal"}

class srt_clean(object):
def __init__(self, file_name):
self.file_name = file_name

def replace_words_(self, file_name):

with open(file_name, 'r') as file:
data = file.read()

for search_text, replace_text in words_.items():
data = re.sub(search_text, replace_text, data)

# Opening our text file in write only ode to write the replaced content
with open(file_name, 'w') as file:

# Writing the replaced data in our ext file
file.write(data)


file_name = "test.srt"
clean = srt_clean(file_name)
clean.replace_words_(file_name)

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