Stefan Sperling:

> What is the reason why other implementations do not enable this
> feature by default?

I don't know, but (partially) ignoring whitespace increases the
risk of matching in the wrong place.  And, as has been mentioned,
there is the problem that added/changed lines then will also have
mangled whitespace.

-- 
Christian "naddy" Weisgerber                          naddy@mips.inka.de