re. Sub() usage

re.sub()
re=regular expression( Regular expressions )
sub=substitute( Replace );
re.sub Is a regular expression replacement function , Used to achieve through regular expressions , Implementation than ordinary string replace More powerful replacement function ;
str.replace(“aaa”, “bbb”): The string str Medium “aaa” Replace with “bbb”

str="sajhaskdhj111sjh111dksd333"
str1=str.replace("111","222")
print(str)#sajhaskdhj111sjh111dksd333
print(str1)#sajhaskdhj111sjh111dksd333

re.sub(pattern, repl, string, count=0, flags=0)
pattern： Pattern string
repl： The string that needs to be replaced with
string： String to be replaced
count： Number of replacements