Re^8: about style: use possessive or atomic?

New Warnings
...

Useless use of greediness modifier
This fixes [Perl #42957].

That links to perldiag which has:

Useless use of greediness modifier '%c' in regex; marked by <-- HERE in m/%s/
(W regexp) You specified something like these:
1.  qr/a{3}?/
2.  qr/b{1,1}+/
[download]
The "?" and "+" don't have any effect, as they modify whether to match more or fewer when there is a choice, and by specifying to match exactly a given numer (sic), there is no room left for a choice.

I’m guessing that’s why the qualification “(redundant)” has been added to the entries for {n}? and {n}+ in perlre#Regular-Expressions?

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

Comment on Re^8: about style: use possessive or atomic? Select or Download Code

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Re^9: about style: use possessive or atomic? by stevieb (Canon) on Aug 16, 2015 at 15:20 UTC
That absolutely makes sense, and I like when `warnings` like this get added. Any time someone can be warned whenever they are trying to use something useless is another tool that will potentially help someone who's trying to debug something they don't understand: "I'm using a quantifier, but why the heck isn't it working!".	[reply] [d/l]