"Stephen J. Turnbull" <[email protected]> writes:
> Jason Dagit writes:
>> Similarly, (\.[0-9]+|)$ is odd to me.
>
> That's an optional fractional part at the end of the line. The
> alternative is empty. Somebody pretty ancient probably wrote that;
> it's an idiom from POSIX "basic regular expressions" where the '?'
> operator didn't exist.
Modern POSIX BREs have ? -- it's just escaped. The ERE
(\.[[:digit:]]+)?
is equivalent to the BRE
\(\.[[:digit:]]\+\)\?
> Nowadays people would usually write that "(\.[0-9]+)?$", I think.
It could well have come about because I was tired and using Emacs'
regexp-opt instead of using my brain.
_______________________________________________
darcs-users mailing list
[email protected]
http://lists.osuosl.org/mailman/listinfo/darcs-users
