Index: nano/src/rcfile.c
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- nano/src/rcfile.c	(revision 5756)
+++ nano/src/rcfile.c	(revision )
@@ -831,7 +831,7 @@
 	    return;
 
 	/* If the regex string is malformed, skip it. */
-	if (!nregcomp(regexstring, REG_EXTENDED | REG_NOSUB))
+	if (!nregcomp(regexstring, NANO_REG_EXTENDED | REG_NOSUB))
 	    continue;
 
 	/* Copy the regex into a struct, and hook this in at the end. */
@@ -1010,9 +1010,9 @@
 	    ;
 #endif
 	else if (strcasecmp(keyword, "color") == 0)
-	    parse_colors(ptr, REG_EXTENDED);
+	    parse_colors(ptr, NANO_REG_EXTENDED);
 	else if (strcasecmp(keyword, "icolor") == 0)
-	    parse_colors(ptr, REG_EXTENDED | REG_ICASE);
+	    parse_colors(ptr, NANO_REG_EXTENDED | REG_ICASE);
 	else if (strcasecmp(keyword, "linter") == 0)
 	    pick_up_name("linter", ptr, &live_syntax->linter);
 	else if (strcasecmp(keyword, "formatter") == 0)
Index: nano/src/search.c
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- nano/src/search.c	(revision 5756)
+++ nano/src/search.c	(revision )
@@ -48,7 +48,7 @@
 
     assert(!regexp_compiled);
 
-    rc = regcomp(&search_regexp, fixbounds(regexp), REG_EXTENDED
+    rc = regcomp(&search_regexp, fixbounds(regexp), NANO_REG_EXTENDED
 #ifndef NANO_TINY
 	| (ISSET(CASE_SENSITIVE) ? 0 : REG_ICASE)
 #endif
Index: nano/src/nano.c
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- nano/src/nano.c	(revision 5756)
+++ nano/src/nano.c	(revision )
@@ -2424,7 +2424,7 @@
 #endif
 		);
 #ifdef HAVE_REGEX_H
-    quoterc = regcomp(&quotereg, quotestr, REG_EXTENDED);
+    quoterc = regcomp(&quotereg, quotestr, NANO_REG_EXTENDED);
 
     if (quoterc == 0) {
 	/* We no longer need quotestr, just quotereg. */
Index: nano/configure.ac
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- nano/configure.ac	(revision 5756)
+++ nano/configure.ac	(revision )
@@ -572,6 +572,19 @@
     fi
 fi
 
+AC_CACHE_CHECK([required enhanced regular expression flag], nano_cv_flag_reg_extended,
+	       [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <regex.h>]],
+						   [[
+						     #ifndef REG_ENHANCED
+						     error: No REG_ENHANCED support!
+						     #endif
+						   ]])],
+				  [nano_cv_flag_reg_extended="REG_EXTENDED | REG_ENHANCED"],
+				  [nano_cv_flag_reg_extended="REG_EXTENDED"])])
+
+AC_DEFINE_UNQUOTED(NANO_REG_EXTENDED, $nano_cv_flag_reg_extended,
+		   [Flag for full range of extended regular expressions])
+
 if test x$color_support = xyes; then
 	# Now check for the end-of-word boundary support (/< and />).
 	AC_MSG_CHECKING([for GNU-style word boundary regex support])
@@ -601,7 +614,7 @@
     size_t nmatch;
     regmatch_t pmatch;
 
-    if (regcomp(&r, "\\\\>", REG_EXTENDED|REG_NOSUB))
+    if (regcomp(&r, "\\\\>", $nano_cv_flag_reg_extended|REG_NOSUB))
 	return 1;
     if (regexec(&r, "word boundary", nmatch, &pmatch, 0))
 	return 1;
@@ -639,8 +652,8 @@
 	AC_MSG_WARN([*** Couldn't successfully compile basic color test with or without _XOPEN_SOURCE_EXTENDED])
 	AC_MSG_WARN([*** This build may not compile. Consider configuring with --disable-color or installing ncurses])),
 	AC_MSG_WARN([*** Can't check need for _XOPEN_SOURCE_EXTENDED when cross-compiling]))
-    fi
-#fi
+#    fi
+fi
 
 AC_MSG_CHECKING([whether LINES and COLS can be redefined])
 AC_TRY_RUN([
Index: nano/src/color.c
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- nano/src/color.c	(revision 5756)
+++ nano/src/color.c	(revision )
@@ -147,7 +147,7 @@
     regex_t rgx;
 
     for (item = head; item != NULL; item = item->next) {
-	regcomp(&rgx, fixbounds(item->full_regex), REG_EXTENDED);
+	regcomp(&rgx, fixbounds(item->full_regex), NANO_REG_EXTENDED);
 
 	if (regexec(&rgx, shibboleth, 0, NULL, 0) == 0) {
 	    regfree(&rgx);