Better syntax for wrapping JavaScript code

[chaosprint]

Currently, glicol-js uses regex to find everything between {{}} as js code:

o: sin {{42*10+20}}

But apperently due to the limitation of JS's regex limitation, you cannot write any {} in your js code.
This can be changed by using some other symbols.
Some options:

o: sin "42*10+20"

o: sin %42*10+20%

o: sin |42*10+20|

Any suggestions?

Edit:

I am now settled with:

o: sin ##42*10+20#

Need this asymmetric style for regex.