tweaks

Author: MatrixMike

CMakeLists.txt

@@ -0,0 +1,9 @@
+
+ cmake_minimum_required(VERSION 3.16.3)
+ project(regex)
+ add_executable(regex1 
+                    regex1.c)
+ add_executable(regex2 
+                    regex2.c)
+
+

dateRegex.c

@@ -0,0 +1,66 @@
+/*
+ * dateRegex.c
+ * 
+ * Copyright 2023 Michael <michael@michael-Inspiron-1501>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ * 
+ * 
+ */
+// 2023/01/22 19:50:27
+// https://regex-generator.olafneumann.org/?sampleText=2020-03-12T13%3A34%3A56.123Z%20INFO%20%20%5Borg.example.Class%5D%3A%20This%20is%20a%20%23simple%20%23logline%20containing%20a%20%27value%27.&flags=i
+#include <stdio.h>
+
+int main(int argc, char **argv)
+{
+	int res;
+	res = useRegex("2020-03-12T13:34:56\\.123Z INFO  \\[org\\.example\\.Class]: This is a #simple #logline containing a 'value'\\.");
+	return 0;
+}
+
+#include <regex.h>
+
+int useRegex(char* textToCheck) {
+    regex_t compiledRegex;
+    int reti;
+    int actualReturnValue = -1;
+    char messageBuffer[100];
+
+    /* Compile regular expression */
+    reti = regcomp(&compiledRegex, "2020-03-12T13:34:56\\.123Z INFO  \\[org\\.example\\.Class]: This is a #simple #logline containing a 'value'\\.", REG_EXTENDED | REG_ICASE);
+    if (reti) {
+        fprintf(stderr, "Could not compile regex\n");
+        return -2;
+    }
+
+    /* Execute compiled regular expression */
+    reti = regexec(&compiledRegex, textToCheck, 0, NULL, 0);
+    if (!reti) {
+        puts("Match");
+        actualReturnValue = 0;
+    } else if (reti == REG_NOMATCH) {
+        puts("No match");
+        actualReturnValue = 1;
+    } else {
+        regerror(reti, &compiledRegex, messageBuffer, sizeof(messageBuffer));
+        fprintf(stderr, "Regex match failed: %s\n", messageBuffer);
+        actualReturnValue = -3;
+    }
+
+    /* Free memory allocated to the pattern buffer by regcomp() */
+    regfree(&compiledRegex);
+    return actualReturnValue;
+}

regex5.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <regex.h>
+
+#define tofind    "^daemons=\\(([^)]*)\\)[ \t]*$"
+
+int main(int argc, char **argv)
+{
+    FILE *fp;
+    char line[1024];
+    int retval = 0;
+    regex_t re;
+    regmatch_t rm[2];
+    //this file has this line "DAEMONS=(sysklogd network sshd !netfs !crond)"
+    const char *filename = "/etc/rc1.d";  // was /etc/rc.conf
+
+    if (argc > 1)
+        filename = argv[1];
+
+    if (regcomp(&re, tofind, REG_EXTENDED) != 0)
+    {
+        fprintf(stderr, "Failed to compile regex '%s'\n", tofind);
+        return EXIT_FAILURE;
+    }
+    printf("Regex: %s\n", tofind);
+    printf("Number of captured expressions: %zu\n", re.re_nsub);
+
+    fp = fopen(filename, "r");
+    if (fp == 0)
+    {
+        fprintf(stderr, "Failed to open file %s (%d: %s)\n", filename, errno, strerror(errno));
+        return EXIT_FAILURE;
+    }
+
+    while ((fgets(line, 1024, fp)) != NULL)
+    {
+        line[strcspn(line, "\n")] = '\0';
+        if ((retval = regexec(&re, line, 2, rm, 0)) == 0)
+        {
+            printf("<<%s>>\n", line);
+            // Complete match
+            printf("Line: <<%.*s>>\n", (int)(rm[0].rm_eo - rm[0].rm_so), line + rm[0].rm_so);
+            // Match captured in (...) - the \( and \) match literal parenthesis
+            printf("Text: <<%.*s>>\n", (int)(rm[1].rm_eo - rm[1].rm_so), line + rm[1].rm_so);
+            char *src = line + rm[1].rm_so;
+            char *end = line + rm[1].rm_eo;
+            while (src < end)
+            {
+                size_t len = strcspn(src, " ");
+                if (src + len > end)
+                    len = end - src;
+                printf("Name: <<%.*s>>\n", (int)len, src);
+                src += len;
+                src += strspn(src, " ");
+            }
+        }
+    } 
+    return EXIT_SUCCESS;
+}

url1.txt

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+https://regexr.com/
+
+Sun 22 Jan 2023 19:55:12 
+https://www.javainuse.com/rexgenerator
+
+

xed1.txt

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+banana