You may put some values which are potentially numeric in a VARCHAR column, and you would like to find them out for more operations. Unfortunately,… Read More »How to Select Numeric Values from a VARCHAR Column
The usual word boundaries in regular expression is b, but MySQL takes POSIX-liked [[:<:]] and [[:>:]] as word boundaries. Now my question is the word… Read More »Do Word Boundaries Match the Beginning and End of a String?
According to MySQL documentation:MySQL :: MySQL 5.7 Reference Manual :: 12.5.2 Regular ExpressionsREGEXP is not case sensitive, except when used with binary strings.It seems to… Read More »Is REGEXP (or RLIKE) Always Case Insensitive?
In the following example, we'd like to select the city name which are regular-expressly like (rlike or regexp) the string 'New York+', but the statement failed… Read More »How to Resolve ERROR 1139 (42000): Got error 'repetition-operator operand invalid' from regexp
In this case, I would identify a string (e.g. 'mountain view') which is a leading or white space prepended string and it should be appended… Read More »How to Use REGEXP or RLIKE to Select Strings First Positioned or Space Prepended