Add regex flags support

For extended & case insensitive regex

docs/Makefile.am

 	echo Timestamp > doxyfile.stamp
 
 
-all-local: doxyfile.stamp doc
-doc: doxyfile.stamp
+html-local: doxyfile.stamp
 
 clean-local:
 	-rm -rf $(top_srcdir)/docs/html $(top_srcdir)/docs/man $(top_srcdir)/docs/doxygen_sqlite3.db

src/include/ttail.h

 #define TTAIL_FLAG_DATE_MIN 2
 #define TTAIL_FLAG_DATE_MAX 4
 #define TTAIL_FLAG_FORMAT 8
+#define TTAIL_FLAG_EXTENDED_RE 16
+#define TTAIL_FLAG_EXTENDED_CI 32
 
 #define TTAIL_DEFAULT_FORMATS {"%m",\
 "%A %B %d, %Y %H:%M:%S",\

src/include/ttail_init.h

 #define TTAIL_LONG_OPT {\
 	{"verbose", no_argument, 0, 'v'},\
 	{"re-prefix", required_argument, 0, 'r'},\
+	{"re-extended", no_argument, 0, 'E'},\
+	{"re-case-insensitive", no_argument, 0, 'I'},\
 	{"prefix-len", required_argument, 0, 'p'},\
 	{"date-format", required_argument, 0, 'f'},\
 	{"date-min", required_argument, 0, 'd'},\
 	{"logfile", required_argument, 0, 'l'},\
 	{0,	0,	0,	0 }\
 }
-#define TTAIL_SHORT_OPT "r:p:f:d:l:m:"
+#define TTAIL_SHORT_OPT "r:EIp:f:d:l:m:"
 
 /**@brief Parse cli arguments and return a ttail_t
  *@param int argc

src/ttail_init.c

 to be > 0");
 					goto ttail_init_err;
 				}
+				break;
+			case 'E':
+			case 'I':
+				/**@todo checks */
+				if(res->flag & TTAIL_FLAG_PREFIX)
+				{
+					fprintf(stderr, "-E & -I options \
+have to be set BEFORE -r option\n");
+					goto ttail_init_err;
+				}
+				res->flag |= c=='E'?TTAIL_FLAG_EXTENDED_RE:\
+					REG_ICASE;
+				break;
 			case 'f':
 				if(res->flag & TTAIL_FLAG_FORMAT)
 				{
 
 int ttail_set_prefix(ttail_t* res, const char* regex)
 {
-	int ret;
+	int ret, cflags;
 	char *re_errbuff;
 	size_t re_errbuff_sz;
 
 		return 1;
 	}
 	res->flag |= TTAIL_FLAG_PREFIX;
+	cflags = 0; /** @todo checks */
+	if(res->flag & TTAIL_FLAG_EXTENDED_RE)
+	{
+		cflags |= REG_EXTENDED;
+	}
+	if(res->flag & TTAIL_FLAG_EXTENDED_CI)
+	{
+		cflags |= REG_ICASE;
+	}
 	ret = regcomp(&res->date_prefix, regex, 0);
 	if(!ret)
 	{