How to get the function name from function definition string using regex in c or c++?

Question

I want to find string from given text. My regular expression is not working. i am not sure what i did mistake. Can some one help me please.

I am expecting ouput as : myFunction

#include <iostream>
#include <string>
#include <regex>
#include <iterator>
using namespace std;

int main()
{

// Target sequence
std::string s = "function myFunction(p1, p2) { return p1 * p2; }";

// An object of regex for pattern to be searched
regex r("/^function\\s+([\\w\\$]+)\\s*\\(/");

// flag type for determining the matching behavior
// here it is for matches on 'string' objects
smatch m;

// regex_search() for searching the regex pattern
// 'r' in the string 's'. 'm' is flag for determining
// matching behavior.
regex_search(s, m, r);

// for each loop
for (auto x : m)
    cout << x << " ";
}

C++ function declaration syntax is too complex to be properly parsed with regex. — πάντα ῥεῖ
– πάντα ῥεῖ, Commented Dec 9, 2018 at 20:55
@πάνταῥεῖ They don't seem to be parsing a C++ declaration, it starts with function instead of a return type. OP: What language are you trying to parse? — user10605163
– user10605163, Commented Dec 9, 2018 at 20:58
Possible duplicate of Regex for extracting functions from c++ code — Dmytro Dadyka
– Dmytro Dadyka, Commented Dec 9, 2018 at 21:01

R Sahu · Accepted Answer · 2018-12-09 21:06:04Z

0

The string you are using for the regex is not correct. You don't need the two / characters at the start and the end. Use:

regex r("^function\\s+([\\w\\$]+)\\s*\\(");
//       ^ No /                         ^ No /

See it working at https://ideone.com/bLavL0.

answered Dec 9, 2018 at 21:06

R Sahu

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