Former Premier League and global referee Webb said Sanchez had not committed an offence according to the current guidelines, so Mark Clattenburg and his assistant were right to allow the goal to stand.
"It's hard to play against Arsenal when you are 1-0 down - they have some good players - but I'm very happy with the second half and we deserved the penalty".
On a day that Arsenal could go top and Tottenham could pull themselves into the top four, neither side made the most of their opportunities as it finished in a 1-1 draw.
Wenger wants his side to continue to push on, saying: "We have been very consistent until now so, even if we are frustrated now, let's try to transform that into positive energy when the Premier League restarts".
After a strong start by Spurs, Arsenal took the upper hand and went ahead in the 42nd minute when Kevin Wimmer headed Mesut Ozil's free-kick into his own net.
He replied, "I don't know".
He said: "I thought he was average yesterday".
"It's a minor problem, but it was common sense for me to rest him and get him to stay at home". "It is not a good law and it still needs further work to make life easier for all the stakeholders in the game".
"I felt it was a bit down to nervousness at the back too". Wenger believes Liverpool and Chelsea have an advantage over Arsenal.
"The penalty was harsh", Wenger said, having described it earlier as "unlucky".
It may not have given Spurs boss Mauricio Pochettino a much-needed win, but it keeps the points tally ticking in a game many predicted to be Spurs' first defeat in the league this year.
"Dembele is a genius", said Pochettino.
When you compete in the Champions League and the Premier League, which for me are the toughest competitions in the world, you need all the squad fit. Wenger said his team played with "nervousness at the back" but acknowledged that it's hard to maintain their usual attacking fluency in an intense derby.
Spurs have lost Dele Alli to what Pochettino termed a "minor" knee injury and he conceded he will need to juggle his resources skilfully if his team are to repeat last season's title challenge.