On 1/25/19 11:32 AM, Kai Peter wrote: > > Really interesting _how_ people think. Find the error: >
You're not even trying:
$ echo 0.0.0.0 | sed 's/\.0/\./g' | sed 's/^0//g' | \
sed 's/\.0/\./g' | sed 's/\.\./.0./g' | sed 's/^0//g'
.0..
It's trivial to enumerate all "valid" (that is, without leading zeros)
IP addresses. The most basic test that any regex should pass is that it
should do nothing on those examples.
