c regex not finding string

Question

I'm trying to create a collection of regexes in C, with no much success.

Currently I'm trying to find include statements with the following regex:

(#include <.+>)|(#include \".+\")

here is my code:

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

char *regex_str = "(#include <.+>)|(#include \".+\")";
char *str = "#include <stdio.h>";

regex_t regex;
int reti;

int main() {
    /* Compile Regex */
    reti = regcomp(&regex, regex_str, 0);

    if (reti) {
        printf("Could not compile regex.\n");
        exit(1);
    }

    /* Exec Regex */
    reti = regexec(&regex, str, 0, NULL, 0);

    if (!reti) {
        printf("Match\n");
    } else if (reti == REG_NOMATCH) {
        printf("No Match\n");
    } else {
        regerror(reti, &regex, str, sizeof(str));
        printf("Regex match failed: %s\n", str);
        exit(1);
    }

    /* Free compiled regular expression if you want to use the regex_t again */
    regfree(&regex);

    return 0;
}

The result I get is: No Match

What am I doing wrong?

Actually, it's working: regex101.com/r/eN4nP6/1

Vlad DX
– Vlad DX

2015-08-16 22:16:14 +00:00
Commented Aug 16, 2015 at 22:16 — Vlad DX
– Vlad DX, Commented Aug 16, 2015 at 22:16

l'L'l · Accepted Answer · 2015-08-16 22:15:22Z

4

You might need to escape your match group:

char *regex_str = "\\(#include [\"<].*[\">]\\)";

Which could likely be rolled into one pattern.

answered Aug 16, 2015 at 22:15

l'L'l

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2 Comments

Tomer Over a year ago

So which character I was supposed to escape?

l'L'l Over a year ago

The ( group ), which is defined by parentheses needs escaping eg. \\( ... \\)

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