support ignore-case-flag for the regexp context key, #42605

src/vs/platform/contextkey/common/contextkey.ts

@@ -112,8 +112,9 @@ export abstract class ContextKeyExpr {
 		}
 
 		let value = serializedValue.slice(start + 1, end);
+		let caseIgnoreFlag = serializedValue[end + 1] === 'i' ? 'i' : '';
 		try {
-			return new RegExp(value);
+			return new RegExp(value, caseIgnoreFlag);
 		} catch (e) {
 			console.warn(`bad regexp-value '${serializedValue}', parse error: ${e}`);
 			return null;
@@ -400,7 +401,7 @@ export class ContextKeyRegexExpr implements ContextKeyExpr {
 	}
 
 	public serialize(): string {
-		return `${this.key} =~ /${this.regexp ? this.regexp.source : '<invalid>'}/`;
+		return `${this.key} =~ /${this.regexp ? this.regexp.source : '<invalid>'}/${this.regexp.ignoreCase ? 'i' : ''}`;
 	}
 
 	public keys(): string[] {

src/vs/platform/contextkey/test/common/contextkey.test.ts

@@ -81,6 +81,7 @@ suite('ContextKeyExpr', () => {
 			testExpression(expr + ' != 5', value != <any>'5');
 			testExpression('!' + expr, !value);
 			testExpression(expr + ' =~ /d.*/', /d.*/.test(value));
+			testExpression(expr + ' =~ /D/i', /D/i.test(value));
 		}
 
 		testBatch('a', true);
@@ -92,7 +93,7 @@ suite('ContextKeyExpr', () => {
 		testExpression('a && !b', true && !false);
 		testExpression('a && b', true && false);
 		testExpression('a && !b && c == 5', true && !false && '5' == '5');
-		testExpression('dddd =~ d.*', false);
+		testExpression('d =~ /e.*/', false);
 		/* tslint:enable:triple-equals */
 	});
 });