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

Stephen J. Turnbull stephen at xemacs.org
Mon Oct 26 15:29:42 UTC 2009

Jason Dagit writes:

 > What does (^|/) match?

The beginning of a path component, either the beginning of a line or a
Unix directory separator.

 > 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.  Nowadays people would usually write that 
"(\.[0-9]+)?$", I think.

More information about the darcs-users mailing list