Rails SQL regular expression

Question

I\'m trying to search for the maximum number in the series A0001, A0002, A1234, A2351, etc... The problem is that the list I\'m searching in also has strings such as AG1089

Answer 1

You did a good job! The thing missing was the REGEXP function which is used for regex in queries:

So in your case use

Drawing.where("drawing_number REGEXP ?", 'A\d{4}')
# the {4} defines that there have to be exactly 4 numbers, change if you need to

In SQL you use the '-colons, which is weird because you normally start regex with /-backslashes