How to extract some formatted string from the buffer using scanf?

I need to extract both "rudolf" and "12" from that long string: "hello, i know that rudolph=12 but it so small..." using scanf, how can I do it?

This buffer can contains any formatted strings like ruby=45 or bomb=1, and I dont know it in advance.

I am trying something like that, but it was unsuccessful

#include <stdio.h>

int main()
{
    char sentence[] = "hello, i know that rudolph=12 but it so small...";
    char name[32];
    int value;

    sscanf(sentence, "%[a-z]=%d", name, &value);
    printf("%s -> %d\n", name, value);

    getchar();
    return 0;
}

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