regexp/no-useless-quantifier

disallow quantifiers that can be removed

• ⚙️ This rule is included in "plugin:regexp/recommended".
• 🔧 The --fix option on the command line (opens new window) can automatically fix some of the problems reported by this rule.

📖 Rule Details

This rule reports quantifiers that can trivially be removed without affecting the pattern.

This rule only fixes constant one quantifiers (e.g. a{1}). All other reported useless quantifiers hint at programmer oversight or fundamental problems with the pattern.

Examples:

• a{1}

  It's clear that the {1} quantifier can be removed.

• (?:a+b*|c*)?

  It might not very obvious that the ? quantifier can be removed. Without this quantifier, that pattern can still match the empty string by choosing 0 many cs in the c* alternative.

• (?:\b)+

  The + quantifier can be removed because its quantified element doesn't consume characters.

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🔧 Options

Nothing.

🚀 Version

This rule was introduced in eslint-plugin-regexp v0.10.0

🔍 Implementation

• Rule source (opens new window)
• Test source (opens new window)