Curly braces in sed

tostay2003 · June 18, 2015, 7:55am

aia:

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.

Perhaps, modifying your regex a bit:
echo "testing.123.xyz.456.txt" | sed -n 's/[^.]*\.\([0-9]\{1,\}\)\..*/\1/p'
[^.]* : keep matching any char that is not a literal period. Stops when it does.

Great.. This works... is ^ in square brackets used as a negation?