add non-capturing group

Author: yehorkardash

src/__tests__/unit/checks/keywords-urls.test.ts

@@ -80,6 +80,12 @@ describe('keywords guardrail', () => {
 		const result = await keywordsCheck({}, '你好12345', KeywordsConfig.parse({ keywords: ['你好123'] }));
 		expect(result.tripwireTriggered).toEqual(false);
 	});
+
+  it('should apply word boundaries to all keywords in a multi-keyword pattern', async () => {
+		const result = await keywordsCheck({}, 'testing hello world', KeywordsConfig.parse({ keywords: ['test', 'hello', 'world'] }));
+		expect(result.tripwireTriggered).toEqual(true);
+		expect(result.info.matchedKeywords).toEqual(['hello', 'world']);
+	});
 });
 
 describe('urls guardrail', () => {

src/checks/keywords.ts

@@ -61,7 +61,7 @@ export const keywordsCheck: CheckFn<KeywordsContext, string, KeywordsConfig> = (
   // \p{L}|\p{N}|_ - any unicode letter, number, or underscore. Alternative to \b
 	// (?<!\p{L}) - not preceded by a letter
 	// (?!\p{L}) - not followed by a letter
-	const patternText = `(?<!\\p{L}|\\p{N}|_)${escapedKeywords.join('|')}(?!\\p{L}|\\p{N}|_)`;
+	const patternText = `(?<!\\p{L}|\\p{N}|_)(?:${escapedKeywords.join('|')})(?!\\p{L}|\\p{N}|_)`;
 	const pattern = new RegExp(patternText, 'giu'); // case-insensitive, global, unicode
 
   const matches: string[] = [];