file - How do I use strtok with every single nonalpha character as a delimeter? (C)

Question

So I have a string:

**BOB**123(*&**blah**02938*(*&91820**FOO**

I want to be able to use strtok to deliminate each word. The delimiter is every single character that is not a letter.

I was suggested to us isalpha, but not sure how I would go about this. Is there a way to do this without naming every single non-alpha character?

Unfortunately NOT allowed to use regex libraries.

Answer 1

#include <stdio.h>
#include <ctype.h>

char *strtok_t(char *str, int (*test)(int ch)){
    static char *store = NULL;
    char *token;
    if(str != NULL){
        store = str;
    }
    if(store == NULL) return NULL;
    while(*store && !test(*store)){//skip delimiter
        ++store;
    }
    if(*store == '') return NULL;
    token=store;
    while(*store && test(*store)){
        ++store;
    }

    if(*store == ''){
        store = NULL;
    } else {
        *store++ = '';
    }
    return token;
}

int main(void){
    char str[128] = "BOB123(&blah02938(*&91820FOO";
    char *token;
    for(token = strtok_t(str, isalpha); token ; token = strtok_t(NULL, isalpha)){
        printf("%s
", token);
    }
    return 0;
}