Re: using a variable to help define a regular expression

"Steffen Schuler" <schuler.steffen@[EMAIL PROTECTED]
> wrote in message 
news:63s7jcF29d8r9U1@[EMAIL PROTECTED]
> On Thu, 13 Mar 2008 07:49:28 +0000, tbh wrote:
>>> {
>>>   base=f30
>>>   gawk 'tolower($5) ~ /^\/'"$base"'\// {
>                         ^^^^^^^^^^^^^^^^
> this is the use of a regex constant with embedded shell variable
>
>>>           print $3, $5, $6

hmmm, everything i've tried along these lines seems to fail (apart from 
hard-coding the "base", which i can resort to if need be). should gawk
3.1.6 
support this?

cheers, Tim

 $ ... | gawk -v base="f30" 'BEGIN {print base} (tolower($5) ~ /^\/f30\//)

{print $5}' | ...
 f30
 /f30/Images/icons/Ticker-Punkte.gif
 /f30/Images/icons/go.gif

 $ ... | gawk -v base="f30" 'BEGIN {print base} (tolower($5) ~ 
/^\/"base"\//) {print $5}' | ...
 f30

 $ ... | gawk -v base="f30" 'BEGIN {print base} (tolower($5) ~ 
/^\/"$base"\//) {print $5}' | ...
 f30

 $ ... | gawk -v base="f30" 'BEGIN {print base} (tolower($5) ~
/^\/$base\//) 
{print $5}' | ...
 f30

 $ gawk --version
 GNU Awk 3.1.6
 Copyright (C) 1989, 1991-2007 Free Software Foundation.