# regexp/no-useless-assertions

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

  • ⚙️ This rule is included in "plugin:regexp/recommended".

# 📖 Rule Details

Some assertion 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


# ❤️ Compatibility

This rule was taken from eslint-plugin-clean-regex (opens new window).
This rule is compatible with clean-regex/no-unnecessary-assertions (opens new window) rule.

# 🚀 Version

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

# 🔍 Implementation