Strasbourg is linked to Paris by the high-speed train "TGV Est Européen" (Paris - Sélestat 2.44 hours, one go and back per day)

TGV link and time travel to Strasbourg

Paris - Sélestat 2h44
Paris - Strasbourg 2h20
Reims - Strasbourg 1h58
Aéroport Roissy-Charles de Gaulle 2h25
Lorraine TGV - Strasbourg 1h10
Lille Europe - Strasbourg 3h30
Rennes - Strasbourg 5h14
Nantes - Strasbourg 5h24
Bordeaux - Strasbourg 6h40

More info :

From Strasbourg Station

Many connection from Strasbourg to Sélestat Station (Line Strasbourg-Sélestat-Colmar-Mulhouse) - departure every 30 minutes during the week (travel time 20 minutes). 
Regional express train timetable on :