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Regex Replace

Replace text with regular expressions online, with replacement templates, capture group references, named groups, and flag controls.

Flags
Current PatternEnter a pattern to begin replacing.
Replace ModeReplace all matches
Replacement Count0 replacements
Output Length0 characters
Replacement Template Tips
  • $1 References capture group 1, 2, and so on.
  • $& References the full current match.
  • $<name> References a named capture group value.
  • $$ Outputs a literal dollar sign.
Replacement Details
Review how each match was transformed by the replacement template.
Replacement details will appear here after the pattern finds matches.
Common Replacement Presets
Load a preset to try typical regex replacement workflows.
Reformat Dates
Turn YYYY-MM-DD into MM/DD/YYYY.
Pattern(\d{4})-(\d{2})-(\d{2})
Replacement$2/$3/$1
Source TextPublished: 2024-10-05
Backup: 2025-01-14
Mask Email Addresses
Keep the first character and domain while hiding the rest of the username.
Pattern(?<user>[A-Za-z0-9._%+-])[A-Za-z0-9._%+-]*@(?<domain>[A-Za-z0-9.-]+\.[A-Za-z]{2,})
Replacement$<user>***@$<domain>
Source Texthelp(at)example.com
support(at)toolmi.com
Collapse Whitespace
Convert repeated spaces, tabs, and line breaks into a single space.
Pattern\s+
Replacement 
Source TextToolMi   makes	text
cleanup easier.
Numbered List to Bullets
Convert ordered steps into Markdown bullet points.
Pattern^(\d+)\.\s+(.+)$
Replacement- $2
Source Text1. Install dependencies
2. Run the build
3. Deploy the app
Tool Overview: Regex Replace


Regex Replace lets you transform text in the browser with JavaScript regular expressions. It supports replacement templates such as $1, $2, $&, and $<name>, making it useful for masking, cleanup, and text restructuring tasks.


Supported Features


    

  • Batch text replacement with regex
    • 

  • Capture group and named group references
    • 

  • g / i / m / s / u / y flag controls
    • 

  • Per-match replacement details
    • 

  • Copy and download output
    • 



How To Use


    

  1. Enter a regex pattern and replacement template.
    2. 

  2. Toggle the flags you need.
    3. 

  3. Paste the source text.
    4. 

  4. Review the replaced output and per-match details.
    5. 

  5. Copy or download the final result.
    6. 



Common Use Cases


    

  • Reformat dates
    • 

  • Mask email addresses, phone numbers, or log fields
    • 

  • Collapse repeated whitespace
    • 

  • Convert text structures into Markdown or other formats
    •