Store Credit Card type/digits & other Payment Info using Payment Description

V5 Tutorial
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In the regular expression, \d is shorthand for [0-9], which means any digit. {4} limits to maximum 4 characters.

Depending on your requirements, you can put together a regular expression using one of the following:

[A-Z0-9] - uppercase alphanumberic
[A-Za-z0-9] - alphanumberic

So if you want 4 alphanumeric characters, you can use [A-Za-z0-9]{4}

NOTE: I haven’t tested this but it should work!

I found info on this and the shorthand codes here: Regexp Tutorial - Shorthand Character Classes

Also you can refer to this guide for details of custom keyboards:

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