The phrase "is regular" can be replaced with numerous synonymous terms that convey a similar meaning. Some alternatives to "is regular" include "is consistent", "is frequent", "is habitual", and "is routine". Other synonyms for this phrase might include "is commonplace", "is normal", and "is typical". Each of these descriptions conveys a sense of regularity or predictability, implying that something occurs with a certain level of frequency or is considered standard or expected. Overall, there are many words that can be used interchangeably with "is regular", depending on the specific context or situation in which they are used.