Try this: SELECT REGEXP_REPLACE( "An essay is, generally, a piece of writing that gives the author's own argument, but the definition is ... ... <看更多>

... <看更多>

Describe the bug Using the expression function substring() when querying MySQL returns empty ("") column. To Reproduce Custom question ... ... <看更多>

This would need to use the LOCATE and SUBSTRING syntax to get the information out of the string. The basic locate syntax you would need is explained here. ... <看更多>

If you are puzzled why your simple usage of the MySQL SUBSTRING() function is not returning anything this could be your solution. ... <看更多>