Bulk Find & Replace Tutorial: Regex Replace and Blank-to-Delete

2026-09-20 · Card Tools

Once you have a batch of card data, you usually need to make bulk edits: swap the prefix of a certain batch, strip extra characters out of card numbers, or update an old platform marker to a new one. With Text Replace, enter a Find what and a Replace with, and the whole batch is handled in seconds.

1. Typical use cases

• Batch-rename a prefix: turn every OLD- card number into NEW-;
• Remove characters: strip stray hyphens or spaces from card numbers (leave Replace with blank to delete);
• Normalize formatting: turn commas into line breaks, or full-width symbols into half-width;
• Build templates in bulk: replace each raw number with a fully wrapped version that includes prefix and suffix.

2. How to use it

1. Paste the card or text data to process into Original Text; multiple lines are fine;
2. Type the text to find into Find what;
3. Type the replacement into Replace with; leave it blank to delete everything found;
4. Click Replace and the result appears on the right, ready to copy or export as a TXT file.

3. Example

4. Regex tips and notes

• The search term is parsed as a regular expression, but typing plain text still performs a normal global replace (every match is replaced);
• If the search term contains regex special characters (such as . * + ?) and the result looks wrong or the page errors, escape those characters or pick a different search term;
• A blank Replace with deletes every match found;
• The replace is global and touches every matching line, so try it on a small sample first to confirm the effect;
• All data is processed locally in the browser and never uploaded or archived.

5. FAQ