Regular match file extension!

for example, to match to .txt, .doc and other extensions, how to write

with regular expressions
Dec.23,2021

  

/. (doc | txt) $/;

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-64f5-1e4dd1f-66904.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4dd1f-66904.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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