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POSIX sh doesn't support that notation but often you can emulate it with short string using something like this:


$ v=substring
$ echo ${v:1:3}
sh: 2: Bad substitution
$ echo ${v%${v#???}}
sub

The substring expansions are not available in the 1988 version of ksh. Does your system include a command called ksh93?

Or to get the first field with numbers, try:
sed -n 's/^\([^0-9.].\)*\([0-9]*\).*/\2/p'
or if is always the second field, try:
cut -d. -f2

Not quite sure what you mean by "above result". However, try sed -rn 's/[^0-9]*([0-9]{1,})[^0-9]*.*/\1/p' file

Exactly:

[AB] # matches "A" or "B"
[^AB] # matches any character except "A" or "B"

You need this quite often, because matches in sed are always "greedy". Suppose the following text:
...

echo "testing.123.xyz.456.txt" | sed -n 's/.*\.\([0-9]\{1,\}\)\..*/\1/p'

The issue is that the red part of the regex matches the part of the string. The `.*' will try to match as much as it can.
...

vDate=`echo $filename | sed -n 's/.*\.\([0-9]\{1,\}\)\..*/\1/gp'`