regulär
regular
Conforming to the rules, the usual procedure, or the standard; normal, ordinary.
Der Zug verkehrt wieder nach dem regulären Fahrplan.
The train is running according to the regular schedule again.

regular
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regular
Conforming to the rules, the usual procedure, or the standard; normal, ordinary.
Der Zug verkehrt wieder nach dem regulären Fahrplan.
The train is running according to the regular schedule again.

The word 'regulär' (regular) is closely related to the noun 'die Regel' (rule). Something that is 'regulär' follows a certain rule, plan, or standard.
Nach der Störung fahren die Züge wieder nach dem regulären Fahrplan.
After the disruption, the trains are running according to the regular schedule again.
Besides the everyday meaning 'normal', 'regulär' (regular) is also used in technical language. In the military, it refers to the official army, and in geometry to figures with equal sides and angles.
Ein gleichseitiges Dreieck ist ein reguläres Dreieck.
An equilateral triangle is a regular triangle.
In everyday language, 'regulär' (regular) often describes standard procedures or conditions. Common combinations are 'der reguläre Preis' (the regular price, as opposed to the discounted price), 'die reguläre Saison' (the regular season) in sports, or 'die reguläre Arbeitszeit' (regular working hours).
Der reguläre Preis für das Ticket beträgt 25 Euro, aber Studenten zahlen weniger.
The regular price for the ticket is 25 euros, but students pay less.
The word 'regulär' (regular) is often used to create a contrast with something special or unusual, for example a special offer, an exception, or a disruption.
Während des Festivals gelten nicht die regulären Öffnungszeiten.
During the festival, the regular opening hours do not apply.
regular
'regelmäßig' and 'regulär' look similar, and both can have something to do with order or rules. 'regelmäßig' is often used when something happens again and again at equal intervals, or when something is evenly shaped. 'regulär' means more that something conforms to the normal procedure, the rules, or the standard. That is why you say, for example, 'regelmäßige Treffen' (regular meetings), but 'regulärer Preis' (regular price) or 'reguläre Arbeitszeit' (regular working hours). There is a risk of confusion especially because of their similar form. As a simple guide: 'regelmäßig' often asks 'how often?', while 'regulär' is more about 'normal or according to the rules?'.

Ab morgen gilt wieder der reguläre Preis für die Tickets.
Starting tomorrow, the regular price for the tickets applies again.
Der Kurs findet regelmäßig jeden Mittwoch statt.
The course takes place regularly every Wednesday.