import RE2 from 're2';
/**
* Executes a regex test using Google's RE2 engine to prevent ReDoS.
* RE2 uses a DFA-based approach that guarantees linear time execution.
*
* @param pattern The regex pattern string
* @param flags The regex flags (e.g., 'i', 'g')
* @param text The text to test
* @returns boolean indicating if the pattern matches the text
*/
export function safeTest(pattern: string, flags: string, text: string): boolean {
try {
const re = new RE2(pattern, flags);
return re.test(text);
} catch (e) {
console.warn(`Regex evaluation failed for pattern: ${pattern}. Error: ${e}`);
return false;
}
}
/**
* Executes a regex test on multiple strings using RE2.
*
* @param pattern The regex pattern string
* @param flags The regex flags
* @param texts Array of strings to test
* @returns Array of booleans indicating matches
*/
export function safeTestBatch(pattern: string, flags: string, texts: string[]): boolean[] {
if (texts.length === 0) return [];
try {
const re = new RE2(pattern, flags);
return texts.map(t => re.test(t));
} catch (e) {
console.warn(`Batch regex evaluation failed for pattern: ${pattern}. Error: ${e}`);
// Default to no matches if it fails
return new Array(texts.length).fill(false);
}
}
