FIltering the found filepaths now fully working. We can now detect opened file descriptors of all processes

src/user/include/utils/strings/regex.c

@@ -0,0 +1,43 @@
+#include <regex.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "regex.h"
+
+/**
+ * @brief Compares string against regular expression for file descriptor detection
+ * 
+ * @param str
+ * @return 0 if matches, 1 if not matching, -1 if error
+ */
+int regex_match_fd(const char* str){
+    regex_t regex;
+    int reti;
+
+    // Compile regular expression (/proc/*/fd/*)
+    reti = regcomp(&regex, "^\\/proc\\/[[:alnum:]]\\+\\/fd\\/[^\n ]\\+$", 0);
+    if (reti) {
+        fprintf(stderr, "Could not compile regex\n");
+        return -1;
+    }
+
+    // Execute regular expression
+    int result = 0;
+    reti = regexec(&regex, str, 0, NULL, 0);
+    if (!reti) {
+        puts("Match");
+        result = 0;
+    }else if (reti == REG_NOMATCH) {
+        result = 1;
+    }else {
+        char msgbuf[100];
+        regerror(reti, &regex, msgbuf, sizeof(msgbuf));
+        fprintf(stderr, "Regex match failed: %s\n", msgbuf);
+        return -1;
+    }
+
+    //Free memory allocated to the pattern buffer by regcomp()
+    regfree(&regex);
+
+    return result;
+}