
regierend
ruling
Describes a person, party, or group that currently exercises political power in a country or region and forms the government.
Der regierende Bürgermeister eröffnete die neue U-Bahn-Linie.
The ruling mayor opened the new subway line.
ruling
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ruling
Describes a person, party, or group that currently exercises political power in a country or region and forms the government.
Der regierende Bürgermeister eröffnete die neue U-Bahn-Linie.
The ruling mayor opened the new subway line.
'regierend' (ruling) is the present participle of the verb 'regieren' (to govern/rule). It is used like an adjective and describes a person or group that is carrying out the action of governing right now.
Die regierende Koalition hat neue Gesetze beschlossen.
The ruling coalition has passed new laws.
This adjective almost always stands directly before a noun (attributive use). Using it alone at the end of a sentence is very rare and often sounds unnatural.
Der regierende Fürst von Monaco hält heute eine Rede.
The ruling prince of Monaco is giving a speech today.
'regierend' (ruling) is mainly used in political contexts. Common combinations are 'die regierende Partei' (the ruling party), 'die regierende Koalition' (the ruling coalition), or 'der regierende Bürgermeister' (the ruling/governing mayor).
Die Umfragewerte für die regierende Partei sind gesunken.
The poll numbers for the ruling party have fallen.
prevailing / ruling
Herrschend and regierend can both express political power. Regierend more precisely refers to a party or group that currently forms the government; herrschend can describe a political position of power more generally. Regierend is therefore particularly appropriate for the party currently in government.

Die regierende Partei bildet seit der letzten Wahl die Regierung.
The ruling party has formed the government since the last election.
Die herrschende Gruppe kontrolliert das Land, ohne eine gewählte Regierung zu bilden.
The ruling group controls the country without forming an elected government.