diff --git a/src/services/formatting/formatting.ts b/src/services/formatting/formatting.ts
index b1ffe3fdb22..4a7033c6f3e 100644
--- a/src/services/formatting/formatting.ts
+++ b/src/services/formatting/formatting.ts
@@ -445,7 +445,7 @@ namespace ts.formatting {
                     if ((<MethodDeclaration>node).asteriskToken) {
                         return SyntaxKind.AsteriskToken;
                     }
-                // fall-through
+                    // fall-through
 
                 case SyntaxKind.PropertyDeclaration:
                 case SyntaxKind.Parameter:
@@ -788,7 +788,7 @@ namespace ts.formatting {
                 }
                 else {
                     lineAdded =
-                    processPair(range, rangeStart.line, parent, previousRange, previousRangeStartLine, previousParent, contextNode, dynamicIndentation)
+                        processPair(range, rangeStart.line, parent, previousRange, previousRangeStartLine, previousParent, contextNode, dynamicIndentation)
                 }
             }
 
@@ -934,7 +934,7 @@ namespace ts.formatting {
                 let lineEndPosition = getEndLinePosition(line, sourceFile);
 
                 // do not trim whitespaces in comments or template expression
-                if (range && (isComment(range.kind) || isTemplate(range.kind)) && range.pos <= lineEndPosition && range.end > lineEndPosition) {
+                if (range && (isComment(range.kind) || isStringOrRegularExpressionOrTemplateLiteral(range.kind)) && range.pos <= lineEndPosition && range.end > lineEndPosition) {
                     continue;
                 }
 
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index f08f3f38460..431e4286eec 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -9,7 +9,7 @@ namespace ts {
     export function getEndLinePosition(line: number, sourceFile: SourceFile): number {
         Debug.assert(line >= 0);
         let lineStarts = sourceFile.getLineStarts();
-        
+
         let lineIndex = line;
         if (lineIndex + 1 === lineStarts.length) {
             // last line - return EOF
@@ -170,7 +170,7 @@ namespace ts {
             case SyntaxKind.VoidExpression:
             case SyntaxKind.YieldExpression:
             case SyntaxKind.SpreadElementExpression:
-                let unaryWordExpression = (<TypeOfExpression|DeleteExpression|VoidExpression|YieldExpression|SpreadElementExpression>n);
+                let unaryWordExpression = (<TypeOfExpression | DeleteExpression | VoidExpression | YieldExpression | SpreadElementExpression>n);
                 return isCompletedNode(unaryWordExpression.expression, sourceFile);
 
             case SyntaxKind.TaggedTemplateExpression:
@@ -252,7 +252,7 @@ namespace ts {
         });
 
         // Either we didn't find an appropriate list, or the list must contain us.
-        Debug.assert(!syntaxList || contains(syntaxList.getChildren(), node)); 
+        Debug.assert(!syntaxList || contains(syntaxList.getChildren(), node));
         return syntaxList;
     }
 
@@ -388,7 +388,7 @@ namespace ts {
                 // if this is the case - then we should assume that token in question is located in previous child.
                 if (position < child.end && (nodeHasTokens(child) || child.kind === SyntaxKind.JsxText)) {
                     const start = child.getStart(sourceFile);
-                    const lookInPreviousChild = 
+                    const lookInPreviousChild =
                         (start >= position) || // cursor in the leading trivia
                         (child.kind === SyntaxKind.JsxText && start === child.end); // whitespace only JsxText 
                     
@@ -425,7 +425,7 @@ namespace ts {
             }
         }
     }
-    
+
     export function isInString(sourceFile: SourceFile, position: number) {
         let token = getTokenAtPosition(sourceFile, position);
         return token && token.kind === SyntaxKind.StringLiteral && position > token.getStart();
@@ -473,7 +473,7 @@ namespace ts {
         let commentRanges = getLeadingCommentRanges(sourceFile.text, token.pos);
 
         return forEach(commentRanges, jsDocPrefix);
-        
+
         function jsDocPrefix(c: CommentRange): boolean {
             var text = sourceFile.text;
             return text.length >= c.pos + 3 && text[c.pos] === '/' && text[c.pos + 1] === '*' && text[c.pos + 2] === '*';
@@ -562,8 +562,13 @@ namespace ts {
         return kind === SyntaxKind.SingleLineCommentTrivia || kind === SyntaxKind.MultiLineCommentTrivia;
     }
 
-    export function isTemplate(kind: SyntaxKind): boolean {
-        return kind >= SyntaxKind.FirstTemplateToken && kind <= SyntaxKind.LastTemplateToken;
+    export function isStringOrRegularExpressionOrTemplateLiteral(kind: SyntaxKind): boolean {
+        if (kind === SyntaxKind.StringLiteral
+            || kind === SyntaxKind.RegularExpressionLiteral
+            || isTemplateLiteralKind(kind)) {
+            return true;
+        }
+        return false;
     }
 
     export function isPunctuation(kind: SyntaxKind): boolean {
@@ -693,7 +698,7 @@ namespace ts {
     }
 
     export function displayPart(text: string, kind: SymbolDisplayPartKind, symbol?: Symbol): SymbolDisplayPart {
-        return <SymbolDisplayPart> {
+        return <SymbolDisplayPart>{
             text: text,
             kind: SymbolDisplayPartKind[kind]
         };
diff --git a/tests/cases/fourslash/whiteSpaceTrimming3.ts b/tests/cases/fourslash/whiteSpaceTrimming3.ts
new file mode 100644
index 00000000000..93d236773e4
--- /dev/null
+++ b/tests/cases/fourslash/whiteSpaceTrimming3.ts
@@ -0,0 +1,10 @@
+/// <reference path="fourslash.ts" />
+
+////let t = "foo \
+////bar     \   
+////"/*1*/
+
+goTo.marker('1');
+edit.insert(";");
+
+verify.currentFileContentIs("let t = \"foo \\\nbar     \\   \n\";");
diff --git a/tests/cases/fourslash/whiteSpaceTrimming4.ts b/tests/cases/fourslash/whiteSpaceTrimming4.ts
new file mode 100644
index 00000000000..59223197681
--- /dev/null
+++ b/tests/cases/fourslash/whiteSpaceTrimming4.ts
@@ -0,0 +1,8 @@
+/// <reference path="fourslash.ts" />
+
+////var re = /\w+   /*1*//;
+
+goTo.marker('1');
+edit.insert("\n");
+
+verify.currentFileContentIs("var re = /\\w+   \n    /;");