regular or irregular
"Mail" is a regular verb. It follows the typical -ed pattern when forming past tense and past participle forms, such as "mailed" and "has mailed."
"Have" is an irregular verb in English.
It's irregular.
It's an irregular verb.
It's an irregular verb.
Ate is an irregular verb.
It's an irregular verb.
It's an irregular verb.
To swim is an irregular verb.
irregular
irregular
By is not a verb, so it is neither regular nor irregular.