Writing Custom Regex Rules

Available for Pro & Enterprise Plans

Beyond CSS selectors (which hide specific places on a page), you can mask data based on text patterns using Regular Expressions (Regex). This is incredibly powerful for hiding proprietary identifiers that appear dynamically.

Creating a Regex Rule

  1. Open the Extension Settings dashboard.
  2. Go to the Rules tab and click "New Rule".
  3. Set the Type to Regex.

Common Examples

1. Internal Project IDs

If your project codes look like PROJ-1234:

\bPROJ-\d{4}\b

2. AWS Access Keys

Matches the standard format for AWS Key IDs (20 chars, starting with AKIA/ASIA):

(AKIA|ASIA)[0-9A-Z]{16}

3. Specific Currency Amounts

Hide any dollar amount over $1,000:

\$\d{1,3}(,\d{3})*(\.\d{2})?
Note: Regex rules run on the text content of the entire page. Complex regexes on very large pages (like an infinite-scroll log file) can impact performance. Use specific patterns rather than generic ones like .*.