regexp/no-standalone-backslash

disallow standalone backslashes (\)

📖 Rule Details

This rule disallows backslash (\) without escape.

E.g. the regular expression /\c/ without the unicode (u) flag is the same pattern as /\\c/.

In most cases, standalone backslashes are used by accident when a control escape sequence (\cX) or another escape sequence was intended. They are very confusing and should not be used intentionally.

This behavior is described in Annex B (opens new window) of the ECMAScript specification.

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🔧 Options

Nothing.

👫 Related rules

• regexp/no-useless-escape

📚 Further reading

• ECMAScript® 2022 Language Specification > Annex B > B.1.4 Regular Expressions Patterns (opens new window)

🚀 Version

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

🔍 Implementation

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