Fix-80080 Show more detailed error message for "Regex parse error" in search (#80495)

* Added buildRegexParseError for better parsing error message

* Fixed message

* Review #1 changes

* Changed error message as per review #2

* Review #3 changes

* Review #4 changes

src/vs/workbench/services/search/node/ripgrepTextSearchEngine.ts

@@ -125,7 +125,7 @@ export function rgErrorMsgForDisplay(msg: string): Maybe<SearchError> {
 	const firstLine = lines[0].trim();
 
 	if (lines.some(l => startsWith(l, 'regex parse error'))) {
-		return new SearchError('Regex parse error', SearchErrorCode.regexParseError);
+		return new SearchError(buildRegexParseError(lines), SearchErrorCode.regexParseError);
 	}
 
 	const match = firstLine.match(/grep config error: unknown encoding: (.*)/);
@@ -150,6 +150,21 @@ export function rgErrorMsgForDisplay(msg: string): Maybe<SearchError> {
 	return undefined;
 }
 
+export function buildRegexParseError(lines: string[]): string {
+	let errorMessage: string[] = ['Regex parse error'];
+	let pcre2ErrorLine = lines.filter(l => (startsWith(l, 'PCRE2:')));
+	if (pcre2ErrorLine.length >= 1) {
+		let pcre2ErrorMessage = pcre2ErrorLine[0].replace('PCRE2:', '');
+		if (pcre2ErrorMessage.indexOf(':') !== -1 && pcre2ErrorMessage.split(':').length >= 2) {
+			let pcre2ActualErrorMessage = pcre2ErrorMessage.split(':')[1];
+			errorMessage.push(':' + pcre2ActualErrorMessage);
+		}
+	}
+
+	return errorMessage.join('');
+}
+
+
 export class RipgrepParser extends EventEmitter {
 	private remainder = '';
 	private isDone = false;

src/vs/workbench/services/search/test/node/textSearch.integrationTest.ts

@@ -376,7 +376,7 @@ suite('Search-integration', function () {
 			});
 		});
 
-		test('invalid regex', () => {
+		test('invalid regex case 1', () => {
 			const config: ITextQuery = {
 				type: QueryType.Text,
 				folderQueries: ROOT_FOLDER_QUERY,
@@ -387,11 +387,30 @@ suite('Search-integration', function () {
 				throw new Error('expected fail');
 			}, err => {
 				const searchError = deserializeSearchError(err.message);
-				assert.equal(searchError.message, 'Regex parse error');
+				let regexParseErrorForUnclosedParenthesis = 'Regex parse error: unmatched closing parenthesis';
+				assert.equal(searchError.message, regexParseErrorForUnclosedParenthesis);
 				assert.equal(searchError.code, SearchErrorCode.regexParseError);
 			});
 		});
 
+		test('invalid regex case 2', () => {
+			const config: ITextQuery = {
+				type: QueryType.Text,
+				folderQueries: ROOT_FOLDER_QUERY,
+				contentPattern: { pattern: '(?<!a.*)', isRegExp: true },
+			};
+
+			return doSearchTest(config, 0).then(() => {
+				throw new Error('expected fail');
+			}, err => {
+				const searchError = deserializeSearchError(err.message);
+				let regexParseErrorForLookAround = 'Regex parse error: lookbehind assertion is not fixed length';
+				assert.equal(searchError.message, regexParseErrorForLookAround);
+				assert.equal(searchError.code, SearchErrorCode.regexParseError);
+			});
+		});
+
+
 		test('invalid glob', () => {
 			const config: ITextQuery = {
 				type: QueryType.Text,