Find the regular expression of Filter alt

there are many cases of alt

alt= "title"
alt= "title"
alt= "title abc"
alt= "title ABC"
alt= "title ABCabc"

how to use the rule to get rid of all the above situations on Filter? Thank you!

Jan.03,2022

alt=\ ". * (? =\")\ "

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-64f5-1b3dddf-2c3b2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3dddf-2c3b2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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