Modifier field with "+" breaks rolling syntax

My D&D_OED sheet (Original Edition Delta) expects to positive ability modifier and attack bonus field showing a '+'. For example: the attack bonus might be "+5". However, this breaks the standard rolling syntax. For example, this... <button type="roll" value="You rolled [[1d20 + @{attack_bonus}]] to hit!" name="roll_attack"></button> ... is broken, in that any positive bonus (e.g., "+5") always results in a roll of zero (0); whereas a zero or negative bonus works as expected.If the field leaves out the '+' (e.g., "5" instead), then the roll button also works as expected. What's the easiest way to parse an integer field with a '+' sign in the context of a roll button like this?

Not a character sheet coder, but Roll20 has always had issues with double math signs and the solution has always been to enclose the value in parenthesis. Wrapping the field in parenthesis should work here.  Example: 1d20++5 will not work but 1d20+(+5) will work

That means you need <button type="roll" value="You rolled [[1d20 + (@{attack_bonus})]] to hit!" name="roll_attack"></button> Generally its a good idea to wrap any individual attributes in parenthesis (anything starting with @{ ), especially if those attributes are calculated through an autocalc.

The extra parentheses fixed it, thanks a bunch!