no-invalid-regexp
Disallow invalid regular expression strings in RegExp constructors
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Recommended
The "extends": "eslint:recommended" property in a configuration file enables this rule
An invalid pattern in a regular expression literal is a SyntaxError when the code is parsed, but an invalid string in RegExp constructors throws a SyntaxError only when the code is executed.
Rule Details
This rule disallows invalid regular expression strings in RegExp constructors.
Examples of incorrect code for this rule:
Open in Playground
/*eslint no-invalid-regexp: "error"*/
RegExp('[')
RegExp('.', 'z')
new RegExp('\\')
Examples of correct code for this rule:
Open in Playground
/*eslint no-invalid-regexp: "error"*/
RegExp('.')
new RegExp
this.RegExp('[')
Please note that this rule validates regular expressions per the latest ECMAScript specification, regardless of your parser settings.
If you want to allow additional constructor flags for any reason, you can specify them using the allowConstructorFlags option. These flags will then be ignored by the rule.
Options
This rule has an object option for exceptions:
"allowConstructorFlags"is an array of flags
allowConstructorFlags
Examples of correct code for this rule with the { "allowConstructorFlags": ["a", "z"] } option:
Open in Playground
/*eslint no-invalid-regexp: ["error", { "allowConstructorFlags": ["a", "z"] }]*/
new RegExp('.', 'a')
new RegExp('.', 'az')
Version
This rule was introduced in ESLint v0.1.4.