This seems as a bug in the server side parser. @patrick will check it out
Quick heads up as I ran into this as well.
message “Unterminated RegExp in expression {{order_amount.toNumber()/100}}”
If I multiply by 0.01 instead, it works just fine :
{{order_amount.toNumber()*0.01}}
If order_amount is already a number and no casting is needed, it works just fine too :
{{order_amount/100}}
Thank you !