Using Regexp to find Social Security Numbers

regexpssn

# Determine whether a string contains a Social Security number.
def has_ssn?(string)
  string.match(/\d{3}\-\d\d\-\d{4}/)
end

# Return the Social Security number from a string.
def grab_ssn(string)
  string[/\d{3}\-\d\d\-\d{4}/]
end

# Return all of the Social Security numbers from a string.
def grab_all_ssns(string)
  string.scan(/\d{3}\-\d\d\-\d{4}/)
end

# 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}/), 'XXX-XX')
end

# 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((/(\d{3})(\d{2})(\d{4})/), '\\1-\\2-\\3').gsub((/\./), '-')

end