diff --git a/lib/extract/patternReg.js b/lib/extract/patternReg.js
new file mode 100644
index 00000000..f8c58fad
--- /dev/null
+++ b/lib/extract/patternReg.js
@@ -0,0 +1 @@
+export default /^url\(#(\w+?)\)$/;
diff --git a/lib/extract/patterns.js b/lib/extract/patterns.js
index 6cc54a1e..733d3e55 100644
--- a/lib/extract/patterns.js
+++ b/lib/extract/patterns.js
@@ -1,6 +1,6 @@
 import rgba from '../rgba';
 let patterns = {};
-let patternReg = /^url\(#(\w+?)\)$/;
+import patternReg from './patternReg'
 
 import {LinearGradientGenerator} from '../../elements/LinearGradient';
 import {RadialGradientGenerator} from '../../elements/RadialGradient';