[darcs-users] Error on systems with case insensitive filesystems

Trent W. Buck twb at cybersource.com.au
Sat Oct 31 08:08:08 UTC 2009

"Stephen J. Turnbull" <stephen at xemacs.org> 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


is equivalent to the BRE


> 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.

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