Bug report: Adding "Register" breaks "From Base" with "Data is not a valid BigNumber" error

[tobek]

Prepending the "From Base" operation with the "Register" operation produces an error "Data is not a valid BigNumber".

Here is an example: https://gchq.github.io/CyberChef/#recipe=Register('(.*)',true,false,false)From_Base(16)&input=MHgyMGE

Expected output should just be 522. Removing the Register operation does not fix the bug, unless you remove it and then refresh.

[Sh1n0g1]

I got the same error using Filter. I guess that Regex doing something bad.
https://gchq.github.io/CyberChef/#recipe=Filter('Line%20feed','%5E%5C%5Cd*$',false)Multiply('Line%20feed')&input=MTAKMTIwCjMwCg

[n1474335]

Thanks for pointing this out. It's a really strange one. It seems to only be a problem when you load in an operation from the Regex module. This module imports XRegExp which seems to break the BigNumber.js library in some way, causing BigNumbers to fail the instanceof BigNumber check.

I don't fully understand why this happens, but there is a handy helper function in the BigNumber library called isBigNumber which can be used instead and fixes things.