Boro had the best of what chances there were in a largely listless encounter, which saw neither side commit too much going forward. The result halted Boro's four-match losing streak but still leaves Mowbray's side six points adrift of the top six in the Championship, where they had resided for much of the season until recently.
"There were a lot of positives but ultimately we are disappointed and frustrated because we didn't win a game we dominated," Mowbray said. "The positives? A clean sheet which we haven't managed in a while; some good passing football; some good individual displays; and we created a lot of chances.
"But we come away frustrated because that was match we feel we could have won if only we had converted one or more of those chances and we could have kick-started our season."
But despite remaining two wins from the play-offs, Mowbray believes Boro can still barge in.
He said: "The rest of the teams just above us us are dropping points and it seems like they are waiting there for us to play catch-up. And we have some of these teams to play in the next few weeks so it is there for us if we can kick-start it."
Peterborough boss Darren Ferguson was also taking the positives despite a result that sees his side remain in the relegation zone.
He said: "We weren't at our best, particularly in the first half, but once got to grips with it we did well.
"When not at your best you have to battle away and we did. That's seven unbeaten now and another point so that's not to bad.
"They are a good team. It looks like their confidence has gone but that doesn't mean they have become a bad team. They played well and caused us problems but we dealt with them well."
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