c - Use sscanf for regex purpose -

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i have string str, if str composed of pure digits, extract digits int, if not, extract nothing or 0.

for example, 

str = "12345";  // composed of pure digits, extract 12345 str = "123abc";  // not pure digits, extract nothing or 0

can using sscanf? how?

int  value; char unused; if (1 == sscanf(mystring, "%d%c", &value, &unused)) {     // success } else {     // bad input }

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