MySQL Regular expression basic character class matching and multiple instance matching

Example:

Only print that contains numbers

Here \ \ is the escape character to remove \ \ No parentheses are also right this is only a small detail--

The individual considers expression [0-9] or [\ \] With an expression or meaning of ' | ' More clearly, though it is equivalent--

Of course, it's just a basic regular expression that often encounters a lot of strange needs, so don't get caught up in the details of the code. https://dev.mysql.com/doc/refman/5.7/en/find relevant information or how Google is used by others when needed

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MySQL Regular expression basic character class matching and multiple instance matching