WHat does the regex parameter in .replace() function mean : I am a beginner in Python. I was trying to replace few unwanted strings that got scraped from the website. So I tried removing them using codes from this website itself. 

df["col_1"].replace('ï»¿', '', regex=True, inplace=True)

What exactly does the regex = True and inplace = True mean?

I am sorry if this question looks stupid but I am not from the coding background. Thanks.