get rid of regex compilerwarning without using "#include <regex.h>"

Question

I am using regex under vxworks and have no possibility to include "regex.h".

I am getting the compilerwarning "unrecognized character escape sequence" for the code if (sscanf(token, "%*[^\[][%d]", &idx) != 1) because of the '\' and the following '['.

Is there a possibility to get rid of that compilerwarning without using the regex.h and stuff like it is done here: Unable to match regex in C

Answer 1

You may want to try something like

#include <stdio.h>

int main(void) {
    char buf[99];
    int idx, n;
    while (fgets(buf, sizeof buf, stdin)) {
        buf[strcspn(buf, "\n")] = 0; // remove ENTER
        if (sscanf(buf, "%*[^[][%d%n", &idx, &n) != 1) {
            printf("no number in %s\n", buf);
        } else {
            printf("number found: %d (left over string: \"%s\")\n", idx, buf + n);
        }
    }
    return 0;
}

See code running on ideone