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eb39fafa4f
includes a (minimal) working wrapper Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
65 lines
1.8 KiB
Markdown
65 lines
1.8 KiB
Markdown
# disallow invalid regular expression strings in `RegExp` constructors (no-invalid-regexp)
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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.
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## Rule Details
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This rule disallows invalid regular expression strings in `RegExp` constructors.
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Examples of **incorrect** code for this rule:
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```js
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/*eslint no-invalid-regexp: "error"*/
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RegExp('[')
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RegExp('.', 'z')
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new RegExp('\\')
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```
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Examples of **correct** code for this rule:
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```js
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/*eslint no-invalid-regexp: "error"*/
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RegExp('.')
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new RegExp
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this.RegExp('[')
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```
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## Environments
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ECMAScript 6 adds the following flag arguments to the `RegExp` constructor:
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* `"u"` ([unicode](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-get-regexp.prototype.unicode))
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* `"y"` ([sticky](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-get-regexp.prototype.sticky))
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You can enable these to be recognized as valid by setting the ECMAScript version to 6 in your [ESLint configuration](../user-guide/configuring).
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If you want to allow additional constructor flags for any reason, you can specify them using an `allowConstructorFlags` option in `.eslintrc`. These flags will then be ignored by the rule regardless of the `ecmaVersion` setting.
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## Options
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This rule has an object option for exceptions:
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* `"allowConstructorFlags"` is an array of flags
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### allowConstructorFlags
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Examples of **correct** code for this rule with the `{ "allowConstructorFlags": ["u", "y"] }` option:
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```js
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/*eslint no-invalid-regexp: ["error", { "allowConstructorFlags": ["u", "y"] }]*/
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new RegExp('.', 'y')
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new RegExp('.', 'yu')
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```
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## Further Reading
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* [Annotated ES5 §7.8.5 - Regular Expression Literals](https://es5.github.io/#x7.8.5)
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