index.md

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Available Rules

💼 Configurations enabled in.
⚠️ Configurations set to warn in.
✅ Set in the plugin:regexp/recommended configuration.
🔧 Automatically fixable by the --fix CLI option.
💡 Manually fixable by editor suggestions.

Possible Errors

Name	Description	💼	⚠️	🔧	💡
no-contradiction-with-assertion	disallow elements that contradict assertions	✅			💡
no-control-character	disallow control characters				💡
no-dupe-disjunctions	disallow duplicate disjunctions	✅			💡
no-empty-alternative	disallow alternatives without elements		✅
no-empty-capturing-group	disallow capturing group that captures empty.	✅
no-empty-character-class	disallow character classes that match no characters	✅
no-empty-group	disallow empty group	✅
no-empty-lookarounds-assertion	disallow empty lookahead assertion or empty lookbehind assertion	✅
no-escape-backspace	disallow escape backspace ([\b])	✅
no-invalid-regexp	disallow invalid regular expression strings in RegExp constructors	✅
no-lazy-ends	disallow lazy quantifiers at the end of an expression		✅
no-misleading-capturing-group	disallow capturing groups that do not behave as one would expect	✅			💡
no-misleading-unicode-character	disallow multi-code-point characters in character classes and quantifiers	✅		🔧	💡
no-missing-g-flag	disallow missing g flag in patterns used in String#matchAll and String#replaceAll	✅		🔧
no-optional-assertion	disallow optional assertions	✅
no-potentially-useless-backreference	disallow backreferences that reference a group that might not be matched		✅
no-super-linear-backtracking	disallow exponential and polynomial backtracking	✅		🔧
no-super-linear-move	disallow quantifiers that cause quadratic moves
no-useless-assertions	disallow assertions that are known to always accept (or reject)	✅
no-useless-backreference	disallow useless backreferences in regular expressions	✅
no-useless-dollar-replacements	disallow useless $ replacements in replacement string	✅
strict	disallow not strictly valid regular expressions	✅		🔧	💡

Best Practices

Name	Description	💼	⚠️	🔧	💡
confusing-quantifier	disallow confusing quantifiers		✅
control-character-escape	enforce consistent escaping of control characters	✅		🔧
negation	enforce use of escapes on negation	✅		🔧
no-dupe-characters-character-class	disallow duplicate characters in the RegExp character class	✅		🔧
no-extra-lookaround-assertions	disallow unnecessary nested lookaround assertions	✅		🔧
no-invisible-character	disallow invisible raw character	✅		🔧
no-legacy-features	disallow legacy RegExp features	✅
no-non-standard-flag	disallow non-standard flags	✅
no-obscure-range	disallow obscure character ranges	✅
no-octal	disallow octal escape sequence				💡
no-standalone-backslash	disallow standalone backslashes (\)
no-trivially-nested-assertion	disallow trivially nested assertions	✅		🔧
no-trivially-nested-quantifier	disallow nested quantifiers that can be rewritten as one quantifier	✅		🔧
no-unused-capturing-group	disallow unused capturing group	✅		🔧	💡
no-useless-character-class	disallow character class with one character	✅		🔧
no-useless-flag	disallow unnecessary regex flags		✅	🔧
no-useless-lazy	disallow unnecessarily non-greedy quantifiers	✅		🔧
no-useless-quantifier	disallow quantifiers that can be removed	✅		🔧	💡
no-useless-range	disallow unnecessary character ranges	✅		🔧
no-useless-two-nums-quantifier	disallow unnecessary {n,m} quantifier	✅		🔧
no-zero-quantifier	disallow quantifiers with a maximum of zero	✅			💡
optimal-lookaround-quantifier	disallow the alternatives of lookarounds that end with a non-constant quantifier		✅
optimal-quantifier-concatenation	require optimal quantifiers for concatenated quantifiers	✅		🔧
prefer-escape-replacement-dollar-char	enforces escape of replacement $ character ($$).
prefer-predefined-assertion	prefer predefined assertion over equivalent lookarounds	✅		🔧
prefer-quantifier	enforce using quantifier			🔧
prefer-range	enforce using character class range	✅		🔧
prefer-regexp-exec	enforce that RegExp#exec is used instead of String#match if no global flag is provided
prefer-regexp-test	enforce that RegExp#test is used instead of String#match and RegExp#exec			🔧
prefer-set-operation	prefer character class set operations instead of lookarounds	✅		🔧
require-unicode-regexp	enforce the use of the u flag			🔧
require-unicode-sets-regexp	enforce the use of the v flag			🔧
sort-alternatives	sort alternatives if order doesn't matter			🔧
use-ignore-case	use the i flag if it simplifies the pattern	✅		🔧

Stylistic Issues

Name	Description	💼	⚠️	🔧	💡
hexadecimal-escape	enforce consistent usage of hexadecimal escape			🔧
letter-case	enforce into your favorite case			🔧
match-any	enforce match any character style	✅		🔧
no-useless-escape	disallow unnecessary escape characters in RegExp	✅		🔧
no-useless-non-capturing-group	disallow unnecessary non-capturing group	✅		🔧
prefer-character-class	enforce using character class	✅		🔧
prefer-d	enforce using \d	✅		🔧
prefer-lookaround	prefer lookarounds over capturing group that do not replace			🔧
prefer-named-backreference	enforce using named backreferences			🔧
prefer-named-capture-group	enforce using named capture groups
prefer-named-replacement	enforce using named replacement			🔧
prefer-plus-quantifier	enforce using + quantifier	✅		🔧
prefer-question-quantifier	enforce using ? quantifier	✅		🔧
prefer-result-array-groups	enforce using result array groups			🔧
prefer-star-quantifier	enforce using * quantifier	✅		🔧
prefer-unicode-codepoint-escapes	enforce use of unicode codepoint escapes	✅		🔧
prefer-w	enforce using \w	✅		🔧
sort-character-class-elements	enforces elements order in character class			🔧
sort-flags	require regex flags to be sorted	✅		🔧
unicode-escape	enforce consistent usage of unicode escape or unicode codepoint escape			🔧

Deprecated

Name	Description	💼	⚠️	🔧	💡
no-assertion-capturing-group	disallow capturing group that captures empty.
no-useless-exactly-quantifier	disallow unnecessary exactly quantifier
no-useless-non-greedy	disallow unnecessarily non-greedy quantifiers			🔧
order-in-character-class	enforces elements order in character class			🔧
prefer-t	enforce using \t			🔧