geregelt
orderly
Proceeding according to fixed rules, in an organized way, or according to a set plan.
Er führt ein sehr geregeltes Leben mit festen Arbeitszeiten.
He leads a very orderly life with fixed working hours.

regulated / orderly
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orderly
Proceeding according to fixed rules, in an organized way, or according to a set plan.
Er führt ein sehr geregeltes Leben mit festen Arbeitszeiten.
He leads a very orderly life with fixed working hours.

'Geregelt' (regulated / orderly) is the past participle of the verb 'regeln' (to regulate). It is used as an adjective to describe a state that is the result of regulation or order.
Bitte warten Sie, bis die Ampel den Verkehr wieder regelt.
Please wait until the traffic light regulates the traffic again.
In the meaning 'geordnet' (orderly), 'geregelt' is often combined with aspects of everyday life. Typical examples are 'ein geregelter Tagesablauf' (an orderly daily routine), 'geregelte Mahlzeiten' (regular meals), or 'in geregelten Verhältnissen leben' (to live in stable circumstances).
Seit er den neuen Job hat, hat er einen geregelten Tagesablauf.
Since he got the new job, he has had an orderly daily routine.
In the meaning 'festgelegt' (defined), 'geregelt' is often found in legal or formal contexts. Common combinations are 'gesetzlich geregelt' (regulated by law), 'vertraglich geregelt' (regulated by contract), or 'nicht eindeutig geregelt' (not clearly regulated).
Die Nutzung des Parkplatzes ist in der Hausordnung geregelt.
The use of the parking lot is regulated in the house rules.
You can distinguish the two meanings well from the context. If it is about personal routines and lifestyle, such as 'Tagesablauf' (daily routine) or 'Leben' (life), the first meaning is intended. If it is about laws, contracts, and regulations, the second meaning is intended.
Er wünscht sich ein geregeltes Familienleben.
He wants an orderly family life.
regular
'regelmäßig' and 'geregelt' can both describe something that is not random or chaotic. 'regelmäßig' mainly emphasizes repetition: something happens every day, every week, or at equal intervals, for example. It can also mean that something is evenly shaped. 'geregelt' emphasizes order, fixed rules, or clear procedures more. It can also mean that something is defined by regulations or contracts. Learners confuse the words because both are related to 'Regel' (rule). As a simple guide: 'regelmäßig' is more about 'How often?', while 'geregelt' is more about 'According to which rules, or in what kind of order?'.

Die Arbeitszeiten sind in diesem Betrieb klar geregelt.
Working hours are clearly regulated in this company.
Für die Prüfung lernt die Familie jetzt regelmäßig am Abend.
The family is now studying regularly in the evenings for the exam.