Question

例如,这里的表述是:

var str =  total = sum(price * qty) * 1.09875 ;

我想从这一表述中提取变数(即总价、价格和价格,但并非总合,因为总价是功能名称)。 j鱼的reg形是什么? 可变名称包括信函、数字或强调,从信件或强调开始。

Answer 1

return "total = sum(price * qty) * 1.09875".match(/[a-z_]w*(?!w*s*()/ig);

在这方面,

[a-z_] matches 1 letter or 1 underscore,
w* matches 0 or more letters, digits or underscore (w means [a-zA-Z0-9_])
(?!…) is a negative lookahead. The match will fail if the stuff inside is matched.
w*s*( matches some letters, followed by some spaces, and then an (. This allows function names to be rejected.