no infinite loop on non global regex

test/index.js

@@ -45,9 +45,30 @@ test ('run regex', (t) => {
   const data = 'foobarfoo';
   const regex = /foo/gu;
   let count = 0;
-  util.run_regex(regex,data,(res)=>{
-    t.is(res[0], 'foo');
+  util.run_regex (regex, data, (res) => {
+    t.is (res[0], 'foo');
     count++;
-  })
-  t.is(count, 2);
+  });
+  t.is (count, 2);
+});
+
+test ('run non-global regex', (t) => {
+  const data = 'foobarfoo';
+  const regex = /foo/u;
+  let count = 0;
+  util.run_regex (regex, data, (res) => {
+    t.is (res[0], 'foo');
+    count++;
+  });
+  t.is (count, 1);
+});
+
+test ('run non-global regex without result', (t) => {
+  const data = 'foobarfoo';
+  const regex = /baz/u;
+  let count = 0;
+  util.run_regex (regex, data, (res) => {
+    count++;
+  });
+  t.is (count, 0);
 });