diff --git a/package.json b/package.json
index 36a77449cba19..55519198ba65a 100644
--- a/package.json
+++ b/package.json
@@ -103,9 +103,7 @@
     "eclipse-theia.builtin-extension-pack": "https://open-vsx.org/api/eclipse-theia/builtin-extension-pack/1.66.2/file/eclipse-theia.builtin-extension-pack-1.66.2.vsix",
     "EditorConfig.EditorConfig": "https://open-vsx.org/api/EditorConfig/EditorConfig/0.14.4/file/EditorConfig.EditorConfig-0.14.4.vsix",
     "dbaeumer.vscode-eslint": "https://open-vsx.org/api/dbaeumer/vscode-eslint/2.1.20/file/dbaeumer.vscode-eslint-2.1.20.vsix",
-    "ms-vscode.references-view": "https://open-vsx.org/api/ms-vscode/references-view/0.0.89/file/ms-vscode.references-view-0.0.89.vsix",
-    "vscode.typescript": "https://open-vsx.org/api/vscode/typescript/1.62.3/file/vscode.typescript-1.62.3.vsix",
-    "vscode.typescript-language-features": "https://open-vsx.org/api/vscode/typescript-language-features/1.62.3/file/vscode.typescript-language-features-1.62.3.vsix"
+    "ms-vscode.references-view": "https://open-vsx.org/api/ms-vscode/references-view/0.0.89/file/ms-vscode.references-view-0.0.89.vsix"
   },
   "theiaPluginsExcludeIds": [
     "ms-vscode.js-debug-companion",
diff --git a/packages/plugin-ext/src/common/plugin-protocol.ts b/packages/plugin-ext/src/common/plugin-protocol.ts
index 613cba65909cb..8555d3947d14f 100644
--- a/packages/plugin-ext/src/common/plugin-protocol.ts
+++ b/packages/plugin-ext/src/common/plugin-protocol.ts
@@ -669,6 +669,11 @@ export interface LanguageContribution {
     configuration?: LanguageConfiguration;
 }
 
+export interface RegExpOptions {
+    pattern: string;
+    flags?: string;
+}
+
 export interface LanguageConfiguration {
     brackets?: CharacterPair[];
     indentationRules?: IndentationRules;
@@ -676,7 +681,7 @@ export interface LanguageConfiguration {
     autoClosingPairs?: AutoClosingPairConditional[];
     comments?: CommentRule;
     folding?: FoldingRules;
-    wordPattern?: string;
+    wordPattern?: string | RegExpOptions;
     onEnterRules?: OnEnterRule[];
 }
 
@@ -702,10 +707,10 @@ export interface DebuggerContribution extends PlatformSpecificAdapterContributio
 }
 
 export interface IndentationRules {
-    increaseIndentPattern: string;
-    decreaseIndentPattern: string;
-    unIndentedLinePattern?: string;
-    indentNextLinePattern?: string;
+    increaseIndentPattern: string | RegExpOptions;
+    decreaseIndentPattern: string | RegExpOptions;
+    unIndentedLinePattern?: string | RegExpOptions;
+    indentNextLinePattern?: string | RegExpOptions;
 }
 export interface AutoClosingPair {
     close: string;
@@ -717,8 +722,8 @@ export interface AutoClosingPairConditional extends AutoClosingPair {
 }
 
 export interface FoldingMarkers {
-    start: string;
-    end: string;
+    start: string | RegExpOptions;
+    end: string | RegExpOptions;
 }
 
 export interface FoldingRules {
@@ -727,9 +732,9 @@ export interface FoldingRules {
 }
 
 export interface OnEnterRule {
-    beforeText: string;
-    afterText?: string;
-    previousLineText?: string;
+    beforeText: string | RegExpOptions;
+    afterText?: string | RegExpOptions;
+    previousLineText?: string | RegExpOptions;
     action: EnterAction;
 }
 
diff --git a/packages/plugin-ext/src/main/browser/plugin-contribution-handler.ts b/packages/plugin-ext/src/main/browser/plugin-contribution-handler.ts
index 08fbf79ea39ca..3b1f2cc18f0d8 100644
--- a/packages/plugin-ext/src/main/browser/plugin-contribution-handler.ts
+++ b/packages/plugin-ext/src/main/browser/plugin-contribution-handler.ts
@@ -21,7 +21,7 @@ import { TextmateRegistry, getEncodedLanguageId, MonacoTextmateService, GrammarD
 import { MenusContributionPointHandler } from './menus/menus-contribution-handler';
 import { PluginViewRegistry } from './view/plugin-view-registry';
 import { PluginCustomEditorRegistry } from './custom-editors/plugin-custom-editor-registry';
-import { PluginContribution, IndentationRules, FoldingRules, ScopeMap, DeployedPlugin, GrammarsContribution, EnterAction, OnEnterRule } from '../../common';
+import { PluginContribution, IndentationRules, FoldingRules, ScopeMap, DeployedPlugin, GrammarsContribution, EnterAction, OnEnterRule, RegExpOptions } from '../../common';
 import {
     DefaultUriLabelProviderContribution,
     LabelProviderContribution,
@@ -488,11 +488,14 @@ export class PluginContributionHandler {
         return Disposable.NULL;
     }
 
-    private createRegex(value: string | undefined): RegExp | undefined {
+    private createRegex(value: string | RegExpOptions | undefined): RegExp | undefined {
         if (typeof value === 'string') {
             return new RegExp(value, '');
         }
-        return undefined;
+        if (typeof value == 'undefined') {
+            return undefined;
+        }
+        return new RegExp(value.pattern, value.flags);
     }
 
     private convertIndentationRules(rules?: IndentationRules): monaco.languages.IndentationRule | undefined {