By is not a verb, so it is neither regular nor irregular.
"Have" is an irregular verb in English.
"Wrote" is an irregular verb.
It's an irregular verb.
irregular verb irregular verb
It's an irregular verb.
To swim is an irregular verb.
Yes it's an irregular verb.
Yes it's an irregular verb.
It's an irregular verb.
It's an irregular verb.
Ate is an irregular verb.
The irregular verb for "said" is "say". The past tense of "say" is "said".