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POSearching for patterns in String, and removing
 

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    <p>I have been tasked with going through a large list of string values, and removing any sign of credit cards. So, if, within the string, I find anything that matches (where n = numerical):</p> <pre><code>nnnn nnnn nnnn nnnn (4 x 4 numerical) nnnnnnnnnnnnnnnn (16 numerical) nnnn-nnnn-nnnn-nnnn (Hyphened) nnnn nnnnnn nnnn (American express?) nnnnnnnnnnnnnn (AX, no spaces) nnnn-nnnnnn-nnnn (AX, Hyphened) </code></pre> <p>I need to replace that part of the string with <code>[CARD NUMBER REMOVED]</code></p> <p>So,</p> <pre><code>"Client called and gave credit card details as 1234123412341234, exp 1201, and will be booked next week" </code></pre> <p>would become:</p> <pre><code>"Client called and gave credit card details as `[CARD NUMBER REMOVED]`, exp 1201, and will be booked next week" </code></pre> <p>I'm thinking RegEx would FIND this, but I have zero regex experience, and there are many patterns. And, how do I replace that portion?</p> <p>I could write something that iterates through each char and does some rule checking, but that seems hacky.</p> <p>Any ideas?</p> <p>I am trying this:</p> <pre><code> 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})$"; const string replacement = "[CARD DETAILS REMOVED]"; var rgx = new Regex(pattern); string cleansedText = rgx.Replace(UncleansedText, replacement); return cleansedText; </code></pre> <p>But it doesn't seem to find a match in this:</p> <p>"1234610008918730^^9-11^^Code 064^"</p>
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