From mboxrd@z Thu Jan  1 00:00:00 1970
From: Brad King <brad.king@kitware.com>
Subject: Re: gitk: Turn short SHA1 names into links too
Date: Fri, 26 Sep 2008 08:15:58 -0400
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References: <alpine.LFD.1.10.0809251657080.3265@nehalem.linux-foundation.org>	 <alpine.LFD.1.10.0809251729440.3265@nehalem.linux-foundation.org>	 <BD7D0F18-32BD-4059-9190-A2C1B101B4C1@wincent.com> <237967ef0809260121w1c7cc516tceb3be2cbebb85bc@mail.gmail.com>
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Cc: Wincent Colaiuta <win@wincent.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Paul Mackerras <paulus@samba.org>,
	Git Mailing List <git@vger.kernel.org>
To: Mikael Magnusson <mikachu@gmail.com>
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Mikael Magnusson wrote:
> 2008/9/26 Wincent Colaiuta <win@wincent.com>:
>> It's a shame that tcl/tk regular expressions don't appear to support
>> anchoring matches against word boundaries (ie. "\b").
> 
> \y appears to achieve this;
> 
> % regexp {abc\y} 'abc'
> 1
> % regexp {abc\y} 'abcd'
> 0
> % regexp {\yabc\y} 'uabc,d'
> 0
> % regexp {\yabc\y} 'u+abc,d'
> 1
> 
> I have tcl/tk 8.5 so I cannot promise that isn't a new addition, I didn't
> look it up anywhere, but it's \y in some other implementations too, so I
> tried it.

It goes back at least as far as tcl/tk 8.2:

http://www.tcl.tk/man/tcl8.2.3/TclCmd/re_syntax.htm#M54

-Brad