CODEWITHSUNDEEP
cstringparsing
user1092043
user1092043

Reputation: 13

Parsing String in C

I need to parse my string but my delimiters are all characters excepts a-z and A-Z. How can I do that?

I thought strtok but I must write all character as delimiter and it would be too long. Exampe string:

Ax'cda2hsa+AsF(f/a as

It needs to be split into: "Ax" "cda" "hsa" "AsF" "f" "a" "as"

Is there any parsing function in C libraries which i can write my all delimeters as an interval ?

Upvotes: 0

Views: 323

Answers (3)

jackdoe
jackdoe

Reputation: 1866

you can just walk thru the string and do that yourself if you don't want to do regex(3)

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

int main(int ac, char *av[]) {
    char string[] = "   Ax'cda2hsa+AsF(f/a as";
    int i,idx,len;
    len = strlen(string);
    #define MAX_SPLIT 256
    #define MAX_SPLIT_MASK (MAX_SPLIT - 1)
    char buf[MAX_SPLIT];
    for (idx = 0, i=0;i<len;i++) {
        char c = string[i];
        if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <='Z')) {
            buf[idx++ & MAX_SPLIT_MASK] = c;
        } else {
            buf[idx++ & MAX_SPLIT_MASK] = '\0';
            if (idx > 1)
                printf("%s\n",buf);
            idx = 0;
        }
    }
    if (idx > 1) {
            buf[idx++ & MAX_SPLIT_MASK] = '\0';
            printf("%s\n",buf);
    }
    #undef MAX_SPLIT
    #undef MAX_SPLIT_MASK

    return 0;
}

Upvotes: 1

Some programmer dude
Some programmer dude

Reputation: 409482

Use strpbrk to find the start of valid characters, and then strspn to get the length. Extract into new string. Repeat until strpbrk returns NULL.

Upvotes: 0

Dave
Dave

Reputation: 11162

If you're looking for a c library function, strspn(str, dict) is useful. It returns the length of the first substring of str containing only characters in dict. Thus,

  strspn("hello world", "leh");

Would return 4.

Upvotes: 1

Related Questions