getPatternContentInspectorPreflightCost (detectors/pattern.ts)

Creates and caches regex‑based PII content inspectors for text filtering.

// Source: https://github.com/danny-avila/librechat | License: MIT | Copyright 2026 LibreChat
// Provided via justclaw.it.com; keep this notice with the code.
import { RE2JS, RE2Set } from 're2js';
import { logger } from '@librechat/data-schemas';
import {
  MAX_PII_CUSTOM_REGEX_CHARACTERS,
  MAX_PII_CUSTOM_REGEX_INSTRUCTIONS,
  MAX_PII_PATTERN_ID_LENGTH,
  MAX_PII_PATTERN_LABEL_LENGTH,
  MAX_PII_PATTERN_LENGTH,
  MAX_PII_PATTERNS_PER_SOURCE,
  getPiiRegexProgramSize,
} from 'librechat-data-provider';
import type {
  FilterPiiCategory,
  MessageFilterPiiConfig,
  FilterPiiCustomPatternConfig,
} from 'librechat-data-provider';
import type { ProtectionFinding, TextContentFragment } from '../types';

interface CompiledPattern {
  readonly id: string;
  readonly label: string;
  readonly patte

... (truncated -- full source via MCP)