From a99cb87186e68d38db7628aa4ea2731576dd8aee Mon Sep 17 00:00:00 2001
From: zepumph <michael.kauzmann@colorado.edu>
Date: Tue, 12 Feb 2019 16:14:33 -0900
Subject: [PATCH] factor out distanceFromOtherObjectPattern,
 https://github.com/phetsims/gravity-force-lab-basics/issues/88

---
 js/util/StringUtils.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/js/util/StringUtils.js b/js/util/StringUtils.js
index d95555e5..150c72eb 100644
--- a/js/util/StringUtils.js
+++ b/js/util/StringUtils.js
@@ -314,6 +314,17 @@ define( function( require ) {
       position -= searchString.length;
       var lastIndex = subjectString.indexOf( searchString, position );
       return lastIndex !== -1 && lastIndex === position;
+    },
+
+    /**
+     * Assert that a template var is in a string. Useful for translated strings with a template var pattern like
+     * "Hello {{meanName}}" --> "Hello goofball". See StringUtils.fillIn() for base usages of template var pattern.
+     *
+     * @param {string} string
+     * @param {string} key
+     */
+    assertContainsKey( string, key ) {
+      assert && assert( string.indexOf( `{{${key}}}` ) >= 0, 'key not' );
     }
   };