diff --git a/src/cre2/cre2.cpp b/src/cre2/cre2.cpp
index 51d0906..7f07a7f 100644
--- a/src/cre2/cre2.cpp
+++ b/src/cre2/cre2.cpp
@@ -22,6 +22,7 @@ OPT_bool(longest_match)
 OPT_bool(log_errors)
 OPT_bool(literal)
 OPT_bool(never_nl)
+OPT_bool(dot_nl)
 OPT_bool(case_sensitive)
 OPT_bool(perl_classes)
 OPT_bool(word_boundary)
diff --git a/src/cre2/cre2.cr b/src/cre2/cre2.cr
index 00c3fb9..45fe6e5 100644
--- a/src/cre2/cre2.cr
+++ b/src/cre2/cre2.cr
@@ -14,6 +14,7 @@ lib LibCre2
   fun opt_perl_classes = cre2_opt_perl_classes(op : Options, flag : Bool) : Nil
   fun opt_word_boundary = cre2_opt_word_boundary(op : Options, flag : Bool) : Nil
   fun opt_one_line = cre2_opt_one_line(op : Options, flag : Bool) : Nil
+  fun opt_dot_nl = cre2_opt_dot_nl(op : Options, flag : Bool) : Nil
   fun opt_encoding = cre2_opt_encoding(op : Options, encoding : Int32) : Nil
   fun opt_max_mem = cre2_opt_max_mem(op : Options, flag : Bool) : Nil
 
diff --git a/src/cre2/cre2.h b/src/cre2/cre2.h
index 7d29997..ccd7601 100644
--- a/src/cre2/cre2.h
+++ b/src/cre2/cre2.h
@@ -21,6 +21,7 @@ void cre2_opt_case_sensitive(cre2_options *opt, int flag);
 void cre2_opt_perl_classes(cre2_options *opt, int flag);
 void cre2_opt_word_boundary(cre2_options *opt, int flag);
 void cre2_opt_one_line(cre2_options *opt, int flag);
+void cre2_opt_dot_nl(cre2_options *opt, int flag);
 void cre2_opt_encoding(cre2_options *opt, encoding_t enc);
 void cre2_opt_max_mem(cre2_options *opt, int m);
 
diff --git a/src/cre2/cre2.o b/src/cre2/cre2.o
index a87fe4f..a856296 100644
Binary files a/src/cre2/cre2.o and b/src/cre2/cre2.o differ
diff --git a/src/rules.cr b/src/rules.cr
index 5efb81a..e500ec6 100644
--- a/src/rules.cr
+++ b/src/rules.cr
@@ -125,12 +125,16 @@ module Tartrazine
                    ignorecase = false, anchored = false)
       @opts = LibCre2.opt_new
       LibCre2.opt_posix_syntax(@opts, false)
-      LibCre2.opt_longest_match(@opts, true)
-      LibCre2.opt_perl_classes(@opts, true)
+      LibCre2.opt_longest_match(@opts, false)
+      # These 3 are ignored when posix_syntax is false
+      # LibCre2.opt_one_line(@opts, !multiline)
+      # LibCre2.opt_perl_classes(@opts, true)
+      # LibCre2.opt_word_boundary(@opts, true)
       LibCre2.opt_encoding(@opts, 1)
-      LibCre2.opt_one_line(@opts, !multiline)
       LibCre2.opt_case_sensitive(@opts, !ignorecase)
+      LibCre2.opt_dot_nl(@opts, dotall)
       pattern = "(m?)#{pattern}" if multiline
+      p! pattern
       @re = LibCre2.new(pattern, pattern.size, @opts)
     end
 
@@ -142,6 +146,10 @@ module Tartrazine
   end
 end
 
-re = Tartrazine::Re3.new("(require-instance|fraction-digits|error-app-tag|error-message|min-elements|max-elements|yin-element|ordered-by|position|modifier|default|pattern|length|status|units|value|range|type|path|enum|base|bit)(?=[^\w\-\:])")
-p! re.match("value ", 0)
+
+# I can't find a combination of flags that makes this match "#foo"
+# and without that this is never going to work.
+re = Tartrazine::Re3.new("#.*$", multiline: true, dotall: false)
+m = re.match("#foo\nbar", 0)
+p m[0], m[1][0]