Bulk Rename Files with Regex Patterns
Use regex-powered batch rename to rename hundreds of images or files with pattern matching.
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Bulk Rename Files with Regex Patterns Part of our complete guide to this topic — see the full series. Simple prefix-counter renaming works for organized sets. When filenames have embedded dates, camera codes, version strings, or structured patterns you need to extract or reformat, regex-powered renaming becomes the only practical option. --- What is How Regex Renaming Works? A regex renamer applies a pattern (the "find" expression) to each filename and constructs a new name from a replacement template: The parentheses in the pattern create capture groups. The replacement references them with , , etc. --- What essential regex syntax for filenames? Regular expressions are standardized in POSIX IEEE Std 1003.1 for shell tools and in the ECMAScript spec for JavaScript. The syntax in most…
Frequently Asked Questions
How do I bulk rename files with a regex pattern?
In a regex-capable renamer, write a capture pattern like /^IMG_(\d+)\.jpg$/ and a replacement like photo-$1.jpg. The engine runs the pattern against each filename, captures groups with parentheses, and inserts them into the replacement string with $1, $2, etc.
How do I remove date stamps from filenames?
Write a regex that matches the date pattern and replace with an empty string. For a filename like photo-2025-12-24-sunset.jpg, the pattern /[- ]?\d{4}-\d{2}-\d{2}/ replaces the date segment with nothing, yielding photo-sunset.jpg. Test the pattern on a small batch first.
How do I add a sequential number to filenames?
Most bulk renamers offer a counter insertion separate from regex — configure a prefix/suffix and a starting number. If you need it in a regex replacement, use the renamer's counter variable like $n or {n:3} in the replacement string alongside your regex capture groups.
How do I change file extensions in bulk?
A regex pattern targeting the extension: /\.jpeg$/ replaced with .jpg changes all .jpeg files to .jpg. Alternatively, target the full extension group: /^(.+)\.jpeg$/ → $1.jpg. Most renamers also have a dedicated extension field so regex isn't needed for this specific case.
What tools bulk rename files?
Browser-based: the bulk image renamer at theproductguy.in. Desktop: PowerRename (Windows 11 built-in PowerToys), Bulk Rename Utility (Windows, free), or Automator + Rename Finder Items (macOS). CLI: the rename command on Linux, or a short Bash/Python script for complex patterns.
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