Allow spaces

src/main/resources/eu/simstadt/regionchooser/website/script/simstadt_openlayers.js

@@ -377,7 +377,7 @@ const regionChooser = (function(){
 		dataPanel.append("<a href='http://simstadt.hft-stuttgart.de/related-softwares/region-chooser/'>SimStadt documentation</a><br>\n");
 		dataPanel.append("<form id='importWKT' style='position:fixed; bottom:0;'>\n" +
 		"<input id='wktPolygon' type='text' placeholder='WKT Polygon' " +
-		"required pattern=' *POLYGON\\(\\([\\-0-9\., ]+\\)\\) *' " +
+		"required pattern=' *POLYGON *\\( *\\([\\-0-9\., ]+\\) *\\) *' " +
 		"title='Please input a valid WKT Polygon. Example : POLYGON((9.961675 49.807053, 9.951375 49.798521, 9.969486 49.797746, 9.961675 49.807053)) '/>\n" +
 		"<input type='submit' value='Import Polygon'/>\n" +
 		"</form>\n");