Derry found the net after 31 minutes but Patterson was brought back for offside.
Wexford Youths were keen to get forward on the resumption with Shane Dempsey having a twenty meter effort fly wide after 53 minutes.
Derry City should have taken the lead before that when Nathan Boyle found himself in possession in front of goal but delayed his shot allowing keeper Doyle to get down and keep the shot out with his outstretched leg.
Fifteen minutes from the end Rory Patterson went down in the area but referee Tommy Connolly wasn’t impressed.
Five minutes later Derry forced a freekick just outside the area to the right of goal but McNamee saw his kick crash into the wall although Schubert should have scored from the breaking ball but lost his footing as he was about to shoot from a few meters out.
Graham Doyle, Craig McCabe, Stephen Last, Gary Delaney (Jonny Bonner 20), Lee Grace, Andy Mulligan, Eric Molloy, Shane Dempsey (Chris Kenny 90), Aidan Keenan, Paul Murphy (Eoin Porter 83), Andrew O’Connor.
Gerard Doherty; Conor McDermott, Nicas Vemmelund, Harry Monaghan (Ryan Doherty 87), Ben Doherty, Conor McCormack, Nathan Boyle (Josh Daniels 71), Barry McNamee, Lukas Schubert, Rory Patterson, Max Karner.