正则表达式验证 YYYY-MM-DD 格式

Question

I am using the Regex to validate the date format(YYYY-MM-DD) using this gem( https://github.com/nicolasblanco/rails_param )

param! :start_date, Date, format: /([12]\d{3}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01]))/, required: true, message: "Query start_date is not specified and invalid"

For right date format also it is saying error Query start_date is not specified

A sample query http://localhost:3005/data?start_date=2008-01-27&end_date=2009-01-27

It's not working

Answer 1

Proper validation of YYYY-MM-DD aka ISO8601 format would be:

require 'date'
input = '2019-12-11'
Date.parse(input).to_s == input

Regular expressions should not be used for this purpose.

Answer 2

显示结果假设您已验证 1900-2019

/^(19[0-9][0-9]|20[0-1][0-9])-(0[0-9]|1[0-2])-(0[0-9]|1[0-9]|2[0-9]|3[0-1])$/