regular_expressions.rb

#Initialize the delimeter pattern
SSN_PATERN=/\d{3}-\d{2}-\d{4}/
SSN_ANY_PATERN=/(?<first)\d{3})\W?(?<second>\d{2})\W?(?<third>\d{4})/

# Determine whether a string contains a Social Security number.
def has_ssn?(string)
	string.match(SSN_PATERN) ? true : false
end

puts "has_ssn? returns true if it has what looks like a SSN"
puts has_ssn?("please don't share this: 234-60-1422") == true

puts "has_ssn? returns false if it doesn't have a SSN"
puts has_ssn?("please confirm your identity: XXX-XX-1422") == false  #Cannot put "xx"


# Get the Social Security Number to a String (Added Xtra)
def ssn_to_string(string)
	string.match(SSN_PATERN).to_s
end

# Return the Social Security number from a string.
def grab_ssn(string)
	ssn_to_string(string).to_s if has_ssn?(string)
end


puts "grab_ssn returns an SSN if the string has an SSN"
puts grab_ssn("please don't share this: 234-60-1422") == "234-60-1422"

puts "grab_ssn returns nil if it doesn't have a SSN"
puts grab_ssn("please confirm your identity: XXX-XX-1422") == nil


# Return all of the Social Security numbers from a string.
def grab_all_ssns(string)
	if has_ssn?(string)
		string.gsub(SSN_PATERN).to_a
	else 
		[]
	end
end

puts "grab_all_ssns returns all SSNs if the string has any SSNs"
puts grab_all_ssns("234-60-1422, 350-80-0744, 013-60-8762") == ["234-60-1422", "350-80-0744", "013-60-8762"]

puts "grab_all_ssns returns an empty Array if it doesn't have any SSNs"
puts grab_all_ssns("please confirm your identity: XXX-XX-1422") == []


# Obfuscate all of the Social Security numbers in a string. Example: XXX-XX-4430.
def hide_all_ssns(string)
	string.gsub(/\d{3}-\d{2}-\d{4}/, 'XXX-XX-XXXX')
end

puts "hide_all_ssns obfuscates any SSNs in the string"
puts hide_all_ssns("234-60-1422, 350-80-0744, 013-60-8762") == "XXX-XX-1422, XXX-XX-0744, XXX-XX-8762"

puts "hide_all_ssns does not alter a string without SSNs in it"
string = "please confirm your identity: XXX-XX-1422"
puts hide_all_ssns(string) == string


# Ensure all of the Social Security numbers use dashes for delimiters.
# Example: 480.01.4430 and 480014430 would both be 480-01-4430.
def format_ssns(string)
	string.gsub(SSN_ANY_PATERN,'\k<first>-\k<second>-\k<third>')
end

puts "format_ssns finds and reformat any SSNs in the string"
puts format_ssns("234601422, 350.80.0744, 013-60-8762") == "234-60-1422, 350-80-0744, 013-60-8762"

puts "format_ssns does not alter a string without SSNs in it"
string = "please confirm your identity: 44211422"
puts format_ssns(string) == string