SQL Select语句（REGEXP）在仅alpha字段中查找特殊字符和数字

Question

I am using mySQL to query a field which would be LastName . I am looking for any errors in the field such as any special characters or numbers. I am not terribly familiar with SQL so this has been a challenge so far. I have written simple statements with REGEXP but I have run into some issues the REGEXP i was using was:

SELECT LastName FROM `DB`.`PLANNAME` where LastName REGEXP '^([0-9])'

now this turned up results where numbers were the first character in the string and i realized that if anything was in the middle of the string that started with a letter this would not pick it out.

To be clear i just need to find the errors not write a code to clean them out.

Any help would be greatly appreciated

Thanks

Pete

Answer 1

Maybe you are looking for something like this:

SELECT LastName FROM `DB`.`PLANNAME` WHERE NOT LastName REGEXP '[A-Za-z0-9]';

Here is a documentation on this:

Table 12.9 String Regular Expression Operators

Answer 2

Something like this should do it for you.

SELECT column FROM table WHERE column REGEXP '[^A-Za-z]'

This will return any rows where a character that is not az. You might want to add in and ' . For O'brien s and von lansing etc. Any characters you think are acceptable should go in the character class [] , http://www.regular-expressions.info/charclass.html .

Demo: https://regex101.com/r/nC9cG7/1