Search code examples
coldfusionmasking

Replacing credit card numbers from a memo field in Coldfusion

I have a string from a memo field with some credit cards on it and I want to mask the numbers to show only the last 4 digits. Example:

<cfset str = "Her card no. is 1234567890123456 which is a bogus number.">

How can I make the value of the str to read:

Her card no. is ************3456 which is a bogus number.

Solution

  • How about something like this. You may need to alter the regex digit match maximum, depending on your credit card number range:

    UPDATED 02.07.18

    <cfset str = "Her card no. is 1234567890123456 which is a bogus number.">
<cfset maskall = true>

<cfset regex = ".*[\s]+([0-9]{8,19})[\s]+.*">

<cfset ccNumberProtected = "">

<cfif REFindNoCase(regex,str)>
  <cfset ccNumber = REReplaceNoCase(str,regex,"\1")>
  <cfif maskall>
    <cfset ccNumberProtected = RepeatString("*",Len(ccNumber))>
  <cfelse>
    <cfset ccNumberProtected = RepeatString("*",Len(ccNumber) - 4) & Right(ccNumber,4)>
  </cfif>
</cfif>

<cfif Len(Trim(ccNumberProtected))>
  <cfset str = "Her card no. is " & ccNumberProtected & " which is a bogus number.">
<cfelse>
  <cfset str = "Card number could not be displayed for security reasons">
</cfif>