Select rows based on first character

ab0716

Hi I have a column with a lot of numbers and some text. Below is a snipet of what my data looks like. I'm tring to hide and exclude all rows that aren't 7 digits long and don't start with 5 (i.e. I only want numbers like 5******).

 

5238403
5236577
3238403
ASKU
523660682
asku
2536614
NI
5236610

 

So far I know how to exclude all the rows that aren't 7 characters long, but I can't figure out how to select the rows that don't begin with 5 (e.g. 2536614).

 

dt<<select where(length(:column) != 7 );

dt<< hide and exclude (1);

ab0716

For some reason that solution still left a few numbers that didn't fit my criteria, but when I split it up as two separate lines it works great! Thanks!

 

dt <<select where(left(:column, 1) != "5" );
dt <<select where(length(:column) != 7, current selection("extend") );