regex lookbehind returns none type-CodePudding

I am trying to extract the string before a parenthesis using regex positive lookbehind like so, but it returns a none type. I want any string before a "(" , so I did this:

func = "public long int void myfunc(int int1, int int2);"` 
pattern = "(?<=\()[a-zA-z0-9] \s?"
temp = re.match(pattern, func)

how can I return the string "myfunc" ?

CodePudding user response：

I should have been using regex look ahead:

pattern = "[a-zA-z0-9] \s?(?=()" this did the trick

CodePudding user response：

Maybe this: ([a-zA-Z_][a-zA-Z_0-9]*)(?=\s*\(), because the function names in many languages start with letters and underscores, then maybe more than one of them or a digit follows. Then is the look ahead possible spaces and the required opening parenthesis.