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Message-ID: <bf05e51c0609050910k226fe36frbbfbe14db34a6b9d@mail.gmail.com>
Date: Tue, 5 Sep 2006 11:10:16 -0500
From: "Aaron Bono" <postgresql@aranya.com>
To: "Mario Splivalo" <mario.splivalo@mobart.hr>, pgsql-sql@postgresql.org
Subject: Re: Postgres regexp matching failure?
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On 9/5/06, Alvaro Herrera <alvherre@commandprompt.com> wrote:
>
>
> In Perl at least, \b is a word boundary.  In PostgreSQL (and probably
> Tcl as well) it's a backslash AFAICT.


More specifically, Perl, Java and Python interpret \b as a backspace in the
Character class only (got that from the Regular Expression pocket reference)
but otherwise are word boundries.  I am not entirely sure what the Character
class context is referring to but it does show that \b is interpreted
differently under different contexts.  PostgreSQL may not have a way (or at
least a very good way) to make this distinction.

Any other thoughts?

==================================================================
   Aaron Bono
   Aranya Software Technologies, Inc.
   http://www.aranya.com
   http://codeelixir.com
==================================================================

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On 9/5/06, <b class="gmail_sendername">Alvaro Herrera</b> &lt;<a href="mailto:alvherre@commandprompt.com">alvherre@commandprompt.com</a>&gt; wrote:<div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>In Perl at least, \b is a word boundary.&nbsp;&nbsp;In PostgreSQL (and probably<br>Tcl as well) it's a backslash AFAICT.</blockquote></div><br>More specifically, Perl, Java and Python interpret \b as a backspace in the Character class only (got that from the Regular Expression pocket reference) but otherwise are word boundries.&nbsp; I am not entirely sure what the Character class context is referring to but it does show that \b is interpreted differently under different contexts.&nbsp; PostgreSQL may not have a way (or at least a very good way) to make this distinction.
<br><br>Any other thoughts?<br clear="all"><br>==================================================================<br>&nbsp;&nbsp; Aaron Bono<br>&nbsp;&nbsp; Aranya Software Technologies, Inc.<br>&nbsp;&nbsp; <a href="http://www.aranya.com">http://www.aranya.com
</a><br>&nbsp;&nbsp; <a href="http://codeelixir.com">http://codeelixir.com</a><br>==================================================================

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