tobiah wrote:
> Sorry, I should have tried harder. I see that the text
> of the match is simply not consumed, so that:
>
> m = re.search('(?=foo)fo', 'food')
>
> succeeds, while
>
> m = re.search('(?=fox)fo', 'food')
>
> does not.
They are more commonly used, and generally more useful, at the end of a
regexp:
m = re.search(r"foo(?=d)","food")
matches, but afterwards m.group(0)=="foo" (without the d). Meanwhile,
m = re.search(r"foo(?=d)","fool")
doesn't match at all.
Carl Banks
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