Re: manpage searches "^\s+keyword\s" vs. ???
- Date: Wed, 30 Jan 2019 20:34:33 +0100
- From: Corinna Vinschen <corinna-cygwin@xxxxxxxxxx>
- Subject: Re: manpage searches "^\s+keyword\s" vs. ???
On Jan 30 13:09, Eric Blake wrote: > On 1/30/19 12:40 PM, Andrey Repin wrote: > > > > > I've been puzzled by this since… forever, it seems. > > This is something in less, but all the `man less` says is "regular expression > > library provided by your system". > > \s is a non-standard regex extension - glibc provides it, Cygwin has not > (at least, historically). POSIX provides [[:space:]] as a portable > alternative (although not all libc have implemented all of POSIX yet), > but is annoyingly long to type. > > Similarly, BSD regex (which is where Cygwin derives its regex from) > supports the non-standard regex extension [[:<:]] as a word boundary, > while glibc has the same feature but spelled \<. I also seem to recall > a patch in the past to teach Cygwin to respect \< by expanding it to > [[:<:]] before calling into the BSD-derived code (although I couldn't > actually find one in a quick search); a similar patch to expand \s into > [[:space:]] would be a reasonable idea. > > > I guess this is down to compilation options at this point. > > Not so much compilation options of man and less, but rather the code > used in Cygwin itself for handling regex. FreeBSD code since we can't use glibc code for licensing reasons. As usual: Patches welcome! (Even a complet replacement wouldn't hurt as long as licensing is no issue) Corinna -- Corinna Vinschen Cygwin Maintainer
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