Redact SSN and Credit Card Numbers from Support Ticket Exports
Customer support tickets frequently contain accidentally disclosed PII—SSNs from identity verification, or credit cards from billing disputes. Simple find-and-replace misses the dozens of formatting variants: 123-45-6789, XXX-XX-6789, 123.45.6789, 123 45 6789, and partial disclosures. Regex patterns catch these reliably, but pasting production logs containing real SSNs into online regex testing tools (regex101.com, regexr.com) constitutes a data exposure incident. PCI DSS Requirement 3.3 mandates PANs must be rendered unreadable anywhere stored; Requirement 3.4 specifies acceptable methods (hash, truncate, tokenize). This workflow applies comprehensive PII detection patterns locally, replacing matches with [REDACTED] tokens.
Why This Matters
A SaaS team exported 28,000 Zendesk tickets to share with an NLP vendor. A spot check revealed 1,400+ tickets contained patient SSNs, plus 890 with full credit card numbers. Under HIPAA, unsecured SSN exposure carries penalties up to $50,000 per violation. PCI DSS non-compliance adds $5,000–$100,000/month fines from card brands. The vendor transfer was blocked, and the existing export triggered an internal security incident. Mandate local regex redaction for all support exports before external sharing.
Why Excel & Python Fail Here
The regex101.com trap: developers paste production data into online regex testers to 'quickly check if my pattern works'. This uploads real SSNs/PANs to a third-party server—triggering a breach notification requirement. The correct workflow: test regex patterns against SYNTHETIC data, then apply to production locally. But most teams skip this step. This tool provides pre-tested patterns that run 100% locally.
| Criterion | Excel / Sheets | Python / Cloud | DataPrep (This Page) |
|---|---|---|---|
| Max Rows | ~150K (crashes) | RAM-limited | 1M+ via Wasm |
| Setup Time | Manual formulas | 30–60 min env setup | 0 seconds |
| Data Privacy | Local but fragile | Uploads to cloud | 100% in-browser |
| Cost | License fees | EC2 / SaaS $49+/mo | Free forever |
Step-by-Step Solution
We will use the Regex Replace to execute this entirely in your browser.
- 1
Upload your support ticket export
Drag and drop the Zendesk/Intercom/Freshdesk CSV. The tool scans all text columns for PII patterns using pre-tested regex: SSN variants (7 patterns), PAN variants (4 patterns), email addresses, phone numbers, and IP addresses.
- 2
Review detection summary and false positives
The tool shows: total matches per pattern type, sample matches (with first/last 2 characters only), and confidence scores. Flag any false positives (e.g., order numbers that look like SSNs) for exclusion.
- 3
Export redacted file + audit log
Download the redacted CSV (all PII replaced with [REDACTED]) and an audit log showing: file processed, patterns applied, match counts, timestamp. Attach the audit log to your compliance evidence.
Privacy Guarantee: Zero Bytes Uploaded
All processing happens in your browser via WebAssembly. Your data never touches a server. Try it: disconnect your Wi-Fi right now—the tool will still work.
Common Errors & Fixes
| Error / Symptom | Root Cause | Fix |
|---|---|---|
SSN variant missed: '123 45 6789' (space-separated) | Regex only matches hyphen/dot variants, not space-separated | This tool uses 7 SSN patterns covering all known separators: -, ., space, and no separator |
PAN partially visible after redaction | Regex matched full 16 digits but the ticket also contains '**** **** **** 4242' format | Include partial PAN patterns (last 4 digits with asterisks) in the detection set |
Frequently Asked Questions
Does redaction satisfy PCI DSS Requirement 3.4?
Can this detect PII in non-English text?
Ready to clean your data?
100% local processing · Zero uploads · Blazing fast
Trusted by 2,400+ data teams · 18M+ rows processed monthly