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Here I want to use any of the following single characters as field seperators: /, [, ] or space.

This equates to the regular expression [/ \][] (just like [ABC] would allow a single A, B or C...

This should correct the "[" and "]" chars around the data and time line.

file=$1
if [ -f $file.gz ]
then command="gunzip -c"
else command=cat
fi
$command $file | awk -F"[/ \\\][]"...

If awk has no file parameter it will process stdin so pipe output of zcat to awk like this:

zcat server.log.gz | awk -F"[/ ]" -v S="24/01/2013 10:10" -v E="24/01/2013 10:30" '...code here...'

if($3>b[3])return 1;
if($3,b[3])return -1;
...
if 3rd field (year) of current line is greater than 3rd field in input parameter (year of start or end date) return 1 (ie > 0).
As you can see...

Thanks for your Solaris corrections MadeInGermany, nice to know that {n,n} regs don't work with nawk.

I'm not quite sure what the requirement is around this last like, the following change
will...

Don't think sed is capable of doing this, this awk script (nawk if you on Solaris) should do what you ask (just change the S and E variables to match your range):

awk -F"[/ ]" -vS="24/01/2013...