Cpcp Cp <cpx...@gmail.com> writes:
> Look this
>
> >>> import re
> >>> text="asdfnbd]"
> >>> m=re.sub("n*?","?",text)
> >>> print m
> ?a?s?d?f?n?b?d?]?
>
> I don't understand the 'non-greedy' pattern.
Since ‘n*’ matches zero or more ‘n’s, it matches zero adjacent to every
actual character.
It's non-greedy because it matches as few characters as will allow the
match to succeed.
> I think the repl argument should replaces every char in text and
> outputs "????????".
I hope that helps you understand why that expectation is wrong :-)
Regular expression patterns are *not* an easy topic. Try experimenting
and learning with <URL:http://www.regexr.com/>.
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`\ standing on my shoulders.” —Hal Abelson |
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Ben Finney
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