gem-hunter
Language: JavaScript
Replace matching strings and regexes in files
Replace matching strings and regexes in files
npm install --global replace-in-files-cli
$ replace-in-files --help
Usage
$ replace-in-files <files…>
Options
--regex Regex pattern to find (Can be set multiple times)
--string String to find (Can be set multiple times)
--replacement Replacement string (Required)
--ignore-case Search case-insensitively
--no-glob Disable globbing
--dry-run Show what would be replaced without making changes
Examples
$ replace-in-files --string='horse' --regex='unicorn|rainbow' --replacement='🦄' foo.md
$ replace-in-files --regex='v\d+\.\d+\.\d+' --replacement=v$npm_package_version foo.css
$ replace-in-files --string='blob' --replacement='blog' 'some/**/[gb]lob/*' '!some/glob/foo'
$ replace-in-files --dry-run --string='old' --replacement='new' file.txt
You can use the same replacement patterns as with `String#replace()`, like `$&`.
When working with quotes in shell commands, escape them with backslashes:
$ replace-in-files --string='\"use strict\";' --replacement='\"use strict\";\nrequire(\"module\");' file.js
Real-world use-case: Bumping version number in a file when publishing to npm
The regex should be JavaScript flavor.
You can also use this package programmatically:
import replaceInFiles from 'replace-in-files-cli'; // Find and replace await replaceInFiles('*.js', { find: ['old', /version \d+/], replacement: 'new' }); // Transform entire file content await replaceInFiles('*.js', { transform: (content, filePath) => `/* Banner */\n${content}` }); // Combine find/replace with transform (transform runs after find/replace) await replaceInFiles('*.js', { find: ['old'], replacement: 'new', transform: (content, filePath) => `/* ${filePath} */\n${content}` });
The transform option provides full control over file content:
find/replacement - transform runs after find/replace operations(content, filePath) for context-aware transformations