Can regularities match arrays?

Isn"t

regular used to match strings? Why is there the following result?
I use it to match arrays!

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Dec.23,2021

implicit conversion is involved here, which actually matches the result after a.toString ()

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-7aee42-25d30.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-7aee42-25d30.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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