The answer is: re.sub(r'(foo)', r'\g<1>123', 'foobar'). Relevant excerpt from the docs: In addition to character escapes and backreferences as described ... ... <看更多>

This chapter will show how to reuse portions matched by capture groups via backreferences. These can be used within the RE definition as well as the replacement ... ... <看更多>

In this video series, we will be tackling Python Regular Expressions from beginners to advanced.This video goes over:1) re. sub -- vanilla ... ... <看更多>

Python regex replace with capture group.py. html = '<iframe src="http://www.foo.com/?video_id=1234" allowfullscreen>'. re.sub('src="([^"]+)', ... ... <看更多>

No, not really, since you need to call re.sub() and give the string to it as an argument. You'd get ugly nested calls. ... <看更多>