GUIDE深度 · Deep dive
Common Regex Replace Uses
Regex replace suits regular bulk edits: date formats, phone redaction, log cleanup and spaces to underscores. It does not suit nested structures; use parsers for complex HTML or JSON.
Examples
Date 2026-10-30 to 2026/10/30: \d{4}-\d{2}-\d{2}.
Mask a phone number: keep the first three and last four.
Collapse spaces: \s+.
Safety
Back up and test on a sample; global replace is not undoable.
Escape HTML before replacing to avoid XSS.
FAQ
Can it rename files?
This tool handles text only; use a shell or script with a dry run for file names.
Can I undo a replace?
The page keeps no history; keep a copy of the original.