Formatting string with RegExp to set delimiter
delimiter, gsub, regex, ruby
Solution
It's strange that you're not getting an exception: The second argument to gsub is required to be a String (or something that can be converted to a String), not a regexp.
Here's a working example:
ssn = '123456789'
ssn.gsub(/(\d{3})(\d{2})(\d{3})/, '\1-\2-\3')
# => "123-45-6789"
There are three groups of digits in the original string. We enclose each group in parentheses. Each pair of parentheses creates a match group. In the replacement string, we use `\1` to include the first match group, `\2` to include the second match group, and `\3` to include the third match group, with dashes between them.
Problem
I'm trying to format a string as follows Ensure all of numbers use dashes for delimiters. Example: 480.01.4430 and 480014430 would both be 480-01-4430. this is what I have come up with so far, but I can't understand why it doesn't work ``` def format_ssns(string) ssn = string[/\d{9}/] ssn.gsub(/\d{9}/, /\d{3}-\d{2}-\d{4}/) end ```