Regular expressions you don't understand: the difference between\ w and\ w

help me explain what the following regular means:
[\ w\ -\.]

Sep.02,2021

matches a single letter or number or underscore or underscore or. The number


matches w (non-empty numeric, English, character, underscore) and-(underscore) and. (point)

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-64f5-1b35058-e4ad.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35058-e4ad.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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