Regex Issue in Rails - ruby-on-rails

Question

I am comparing data type values from expected value which stored in database to actual response.I am using below code for validating value .I am getting undefined "string_between_markers" method error while comparing.I understood there is no predefined method is available in expected_value string.How to call string_between_markers for compare regex.
In DB Pattern regex has below value Pattern_Regex_[^([0-9]{1,3}).([0-9]{1,3}).([0-9]{1,3}).([0-9]{1,3})]
def validate_value? (actual_value)
if expected_value.include? "Pattern_Regex"
# get the regex from []
regex = expected_value.string_between_markers("[","]")
if expected_value.match(regex)
result = "Passed"
end
end
#String Between Method
def string_between_markers marker1, marker2
self[/#{Regexp.escape(marker1)}(.*?)#{Regexp.escape(marker2)}/m, 1]
end
end

Answer 1

The issue is that you are calling a method on String that is not defined correctly. There are two ways.
First solution
def string_between_markers(input, marker1, marker2)
input[/#{Regexp.escape(marker1)}(.*)#{Regexp.escape(marker2)}/m, 1]
end
and then call it like this:
string_between_markers(expected_value, "[","]")
Second solution
Create a file like lib/ext/string.rb with the following code:
class String
def string_between_markers(marker1, marker2)
self[/#{Regexp.escape(marker1)}(.*)#{Regexp.escape(marker2)}/m, 1]
end
end
Then, in your code, you have to require this file by calling require 'ext/string' or by adding lib folder to autoload paths.
After that, you are calling the method as you did before:
expected_value.string_between_markers("[","]")