How to fix an error with unbalanced parenthesis at position x?

Question

The following code gives me the error

"unbalanced parenthesis at position 22"

This error is triggered at line change = re.search(word[indice], contenu) . I manage to remove the parentheses in the "contenu" variable but the error persists. Do you know what this could be due to?

import re
myTxt= open('MyFile.txt')
contenu = myTxt.read()
contenu = contenu.replace("\"","\\\"")
contenu = contenu.replace("\'", "\\\'")
contenu = contenu.replace(")", "")
contenu = contenu.replace("(", "")
for indice in range(0,len(word)):
    change = re.search(word[indice], contenu)
    if change != None:
        re.sub(word[indice], aRemplacer[indice], contenu)
        
myTxt.close()

"word" and "aRemplacer" are two tables previously created on my notebook, so the error does not come from forgetting to instantiate these variables.

Thank you in advance for any answers.