On Wed, Dec 4, 2019 at 9:18 AM Serhiy Storchaka <storch...@gmail.com> wrote:
> [Guido] > > I think I am +1 on > > adding re.findfirst() as proposed by the OP. > > It is not clear what it should return. A Match object, a string, a > tuple, whatever? What should it return if no match found -- None, en > empty string, an empty tuple, error? I suppose that different users can > have different need. It is not practical to provide functions for all > combinations, it is easy to write a function for your needs using > re.search(). We can only add some receipts in the documentation. > > The concrete user code can be a little bit simpler (one-liner) if we > provide an empty match object. For example: > > (re.search(patter.string) or EmptyMatch).groups() > Still pretty obscure. I propose that re.findfirst(...) should return the same thing as re.findall(...)[0] *if the findall() returns a non-empty list*, and otherwise it should return a default. The default defaults to None but can be set by passing default=... to the re.findfirst() call. For simple cases (no capturing groups, or a single one) that will return a string or the default value; if there are multiple capturing groups it will return a tuple of strings or the default. If the user always wants a tuple they can do so by specifying an appropriate tuple as default value; I don't propose to try and match the shape of the tuple on a successful match. -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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