newbie fscanf %[ conversions, multipliers

Hi,

I am using fscanf() to read words. But I want to match alphanumeric
characters only. However the program, when using the conversion
specifier %255[a-z,A-Z] prints only spaces and other non-standard
ascii characters. I have listed a small example below. Can someone
please tell me what I am doing wrong or forgetting, with regards to
the conversion specifier ? Thankx. !

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define MAXWORDLEN 256

int main(void) {
char word[MAXWORDLEN];
char *bigr[2];
int i = 0;

bigr[0] = calloc(MAXWORDLEN, sizeof(char));
bigr[1] = calloc(MAXWORDLEN, sizeof(char));

while(fscanf(stdin, "%255[a-z,A-Z]", word) != EOF) {
strcpy(bigr[i++], word);
if(i == 2) {
printf("%s %s\n", bigr[0], bigr[1]);
strcpy(bigr[0], bigr[1]);
i = 1;
}
}

return 0;
}
.

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