tabs or spaces

matchers.json

@@ -4,7 +4,7 @@
             "owner": "go",
             "pattern": [
                 {
-                    "regexp": "(\\.{0,2}[\\/\\\\].+\\.go):(?:(\\d+):(\\d+):)? (.*)",
+                    "regexp": "^\\s*(\\.{0,2}[\\/\\\\].+\\.go):(?:(\\d+):(\\d+):)? (.*)",
                     "file": 1,
                     "line": 2,
                     "column": 3,