From: Matt Slay <mattslay@...>
Date: 2010-12-16T00:45:50+09:00
Subject: Re: Split a string at a certain character

> \d+ means "a digit, one or more times"
>
> (?: ... ) makes a non-capturing group
>
> (?: ... )? means "this group 0 or 1 times"
>
> So the part of your regexp where you have
>
> (?:\d+)?
>
> says "one or more digits, 0 or more times". Ruby is pointing out that
> this is a convoluted way of saying "0 or more digits", and is optimising
> it to:
>
> \d*
>
> (where '*' means 0 or more times)

I see now.  I made this change and the message has gone away.

Thanks fo taking the time to give such a thorough explanation.

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