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You need to use the MySQL REGEXP syntax for the expression:
^[^[:space:]]+/[0-9]+/[^[:space:]]+$
where
^
– start of string[^[:space:]]+
– 1 or more characters other than whitespace/
– a/
symbol[0-9]+
– 1 or more digits/
– a/
[^[:space:]]+
– 1 or more characters other than whitespace$
– end of string.
Source:stackexchange.com