Finding each zero-length match only once, when doing regex replacements.

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5319 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2015-07-26  Benno Schulenberg  <bensberg@justemail.net>
+	* src/search.c (do_replace_loop): When doing regex replacements, find
+	 each zero-length match only once.  This fixes Savannah bug #45626.
+
 2015-07-25  Benno Schulenberg  <bensberg@justemail.net>
 	* src/global.c (shortcut_init, strtosc), src/files.c (savefile),
 	doc/man/nanorc.5, doc/texinfo/nano.texi: Add a new bindable function,

src/search.c

@@ -757,6 +757,12 @@ ssize_t do_replace_loop(
 #endif
 	    }
 
+#ifdef HAVE_REGEX_H
+	    /* Don't find the same zero-length match again. */
+	    if (match_len == 0)
+		match_len++;
+#endif
+
 	    /* Set the cursor at the last character of the replacement
 	     * text, so searching will resume after the replacement
 	     * text.  Note that current_x might be set to (size_t)-1