Re: [opensuse] regexp -- defference between \< and \b ?

On Tuesday 29 April 2008 21:53, David C. Rankin wrote:
Randall R Schulz wrote:
On Tuesday 29 April 2008 17:58, David C. Rankin wrote:
Listmates:

With regular expressions, what is the difference between \< and
\b ? The man page says:

Which man page? ...

Actually it comes from man grep. Specifically:

The Backslash Character and Special Expressions
The symbols \< and \> respectively match the empty string at
the beginning and end of a word. The symbol \b matches the empty
string at the edge of a word, ...

I guess it's been a long time since I've read the man page for the grep
family. I didn't realize \b and \B were a part of Gnu grep.


end. Boundaries are either. (Am I going too fast for you??)

Trying to digest BRE (basic RE), ERE (extended RE) and ARE (Advanced
RE) in a couple of readings itself moves too fast for me ;-)

Personally, I prefer the old-style \< and \> but apparently they're
a thing of the past.

I know that the Java standard library RE patterns don't have \< and \>,
and apart from egrep and sed, most of the time I enter a regular
expression it's in a Java application (or code) that uses those library
classes, so I have to use \b.


Thanks for your help Randall!

Sure. I learned something, too.


--
David C. Rankin


Randall Schulz
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