正则表达式不匹配负整数

Question

I have a query for my Payment model. My amount column is an integer. I want to eliminate negative integers from my amount column. I just want to show payments with positive values.

Payment.where('amount NOT REGEXP ?', '^-\d+$')

and

Payment.where('amount NOT REGEXP ?', '^-\d*\.?\d+$'

both work in Rubular, but do not work in my Rails app. I tried matching in the console, and it does not work too:

amount.to_i =~ /^-\d*\.?\d+$/

I know that >= 0 condition will work, but I wonder why it does not work with REGEX .

Answer 1

如果您只是想删除负整数，那么在提高性能的同时，这种方法是否也能正常工作？

Payment.where('amount >= 0')

Answer 2

I think your regexp works in console.

$ irb
irb(main):001:0> /^-\d*\.?\d+$/ =~ "-3"
=> 0
irb(main):002:0> $~
=> #<MatchData "-3">
irb(main):003:0> /^-\d*\.?\d+$/ =~ "-3.1415"
=> 0
irb(main):004:0> $~
=> #<MatchData "-3.1415">
irb(main):005:0> /^-\d*\.?\d+$/ =~ "128"
=> nil
irb(main):006:0>