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regexp/no-useless-assertions

💼 This rule is enabled in the ✅ plugin:regexp/recommended config.

💡 This rule is manually fixable by editor suggestions.

disallow assertions that are known to always accept (or reject)

📖 Rule Details

Some assertions are unnecessary because the rest of the pattern forces them to always be accept (or reject).

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Limitations

Right now, this rule is implemented by only looking a single character ahead and behind. This is enough to determine whether the builtin assertions (\b, \B, ^, $) trivially reject or accept but it is not enough for all lookarounds. The algorithm determining the characters ahead and behind is very conservative which can lead to false negatives.

🔧 Options

Nothing.

❤️ Compatibility

This rule was taken from eslint-plugin-clean-regex.
This rule is compatible with clean-regex/no-unnecessary-assertions rule.

🚀 Version

This rule was introduced in eslint-plugin-regexp v0.9.0

🔍 Implementation