Question

I’m trying to remove all type casts from a js file.

The current (not-working) regex I have is:

/(?!new\s+&?!function\s+)\w+\((.+)\)/gi

Basically I want anything like Class(var) but not new Class(arg) or function Func(arg)

Thanks!

Answer 1

 s = "Basically I want anything like Class(var) but not new Class(arg) or function Func(arg)"

re = /(?:(?!new|function)\b\S+|^|[^\w\s])\s*\b([A-Z]\w*\s*\(.*?\))/g

for (var match; (match = re.exec(s));) { alert(match[1]); }

produces

 Class(var)

but will only match correctly if there are no nested parentheses in the actual parameter list. To generally match a function call is not possible using regular expressions since regular grammars can’t handled nested parenthetical groups.