tldr/pages/common/fastmod.md

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# fastmod
> A fast partial replacement for the codemod tool, replace and replace all in the whole codebase.
> Regexes are matched by Rust regex crate.
> More information: <https://github.com/facebookincubator/fastmod>.
- Replace a regex pattern in all files of the current directory, ignoring files on .ignore and .gitignore:
`fastmod {{regex_pattern}} {{replacement}}`
- Replace a regex pattern in case-insensitive mode in specific files or directories:
`fastmod --ignore-case {{regex_pattern}} {{replacement}} -- {{path/to/file path/to/directory ...}}`
- Replace a regex pattern in a specific directory in files filtered with a case-insensitive glob pattern:
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`fastmod {{regex}} {{replacement}} --dir {{path/to/directory}} --iglob {{'**/*.{js,json}'}}`
- Replace for an exact string in `.js` or JSON files:
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`fastmod --fixed-strings {{exact_string}} {{replacement}} --extensions {{json,js}}`
- Replace for an exact string without prompt for a confirmation (disables regular expressions):
`fastmod --accept-all --fixed-strings {{exact_string}} {{replacement}}`
- Replace for an exact string without prompt for a confirmation, printing changed files:
`fastmod --accept-all --print-changed-files --fixed-strings {{exact_string}} {{replacement}}`