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docs(regex): clarify regex manager limitations (#16709)

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foolioo 2022-07-24 06:25:45 +00:00 committed by GitHub
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lib/modules/manager/regex/readme.md
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@ -51,6 +51,9 @@ If you're looking for an online regex testing tool that supports capture groups,
Be aware that backslashes (`'\'`) of the resulting regex have to still be escaped e.g. `\n\s` --> `\\n\\s`. Be aware that backslashes (`'\'`) of the resulting regex have to still be escaped e.g. `\n\s` --> `\\n\\s`.
You can use the Code Generator in the sidebar and copy the regex in the generated "Alternative syntax" comment into JSON. You can use the Code Generator in the sidebar and copy the regex in the generated "Alternative syntax" comment into JSON.
The `regex` manager uses [RE2](https://github.com/google/re2/wiki/WhyRE2) which does not support [backreferences and lookahead assertions](https://github.com/uhop/node-re2#limitations-things-re2-does-not-support).
The `regex` manager matches are done per-file and not per-line, you should be aware when using the `^` and/or `$` regex assertions.
### Configuration templates ### Configuration templates
In many cases, named capture groups alone won't be enough and you'll need to configure Renovate with additional information about how to look up a dependency. In many cases, named capture groups alone won't be enough and you'll need to configure Renovate with additional information about how to look up a dependency.