Need Function to Redact SSNs and CCs from a string 1

annethorne · Mar 5, 2015

Hi everyone,

I need a function to redact possible SSNs and CCs from a string.

This is for an application that receives messages from customers, which may contain SSNs or CCs. Instead of passing on that message, we want to redact it of the sensitive information.

We do have some SQL functions that do this, but I want to duplicate what they do in C# as we don't want to use Databases:

http://files.engineering.com/getfil...7f7a10&file=dbo.fnFixCCandSSN-sqlFunction.txt

http://files.engineering.com/getfil...67819b&file=dbo.fnIsLuhnValid-sqlFunction.txt

Have any of you done this sort of thing before?
All the Best to You!
Anne

annethorne · Mar 5, 2015

I have found this reference:

http://foobook.org/erbere/scraps/find-and-replace-text-with-regex/

annethorne · Mar 5, 2015

I think I have found my answer:

[pre]private static string RedactCC(string stringToRedact)
{
const string pattern = @"(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})";
stringToRedact = Regex.Replace(
stringToRedact,
pattern,
m => "***-**-" + m.Value.Substring(m.Value.Length - 4, 4));
return stringToRedact;
}[/pre]

[pre]private static string RedactSSN(string stringToRedact)
{
const string pattern = @"\d{3}-\d{2}-\d{4}";
stringToRedact = Regex.Replace(
stringToRedact,
pattern,
m => "***-**-" + m.Value.Substring(m.Value.Length - 4, 4));
return stringToRedact;
}[/pre]

Maybe this post will help someone else in the future.

Anne

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Need Function to Redact SSNs and CCs from a string 1

annethorne

Programmer

annethorne

Programmer

annethorne

Programmer

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