Description of problem: 
-----------------------
the rpl -w option (match only on word boundaries) seems that don't work properly.

Version-Release number of selected component (if applicable): 
-------------------------------------------------------------
rpl-1.5.5-2.fc11

How reproducible:
-----------------
allways

Steps to Reproduce: 
-------------------
#!/bin/bash
#creating data file
rm -f test1.txt;
SEQ1=$(seq 15000);
for i in $SEQ1
do
  echo $i" : grande" >> test1.txt;
done
#running replace (with -w option -> 0 replaces)
SEQ2=$(seq 1);
for i in $SEQ2
do
  rpl -w "rande" "grande" test1.txt;
done
#showing error (more than 1 replaces done)
grep gg test1.txt;

Actual results:
---------------
some replacements made(grande -> ggrande)

Expected results:
-----------------
no replacements made

Additional info:
----------------
> uname -a
> Linux imd1.imagina.local 2.6.29.6-217.2.8.fc11.x86_64 #1 SMP Sat Aug 15 01:06:26 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
> python
> Python 2.6 (r26:66714, Jun  8 2009, 16:07:29)
> [GCC 4.4.0 20090506 (Red Hat 4.4.0-4)] on linux2