disallow control characters in regular expressions (no-control-regex)

The "extends": "eslint:recommended" property in a configuration file enables this rule.

Control characters are special, invisible characters in the ASCII range 0-31. These characters are rarely used in JavaScript strings so a regular expression containing these characters is most likely a mistake.

Rule Details

This rule disallows control characters in regular expressions.

Examples of incorrect code for this rule:

/*eslint no-control-regex: "error"*/

var pattern1 = /\x1f/;
var pattern2 = new RegExp("\x1f");

Examples of correct code for this rule:

/*eslint no-control-regex: "error"*/

var pattern1 = /\x20/;
var pattern2 = new RegExp("\x20");

When Not To Use It

If you need to use control character pattern matching, then you should turn this rule off.

Related Rules

• no-div-regex
• no-regex-spaces

Version

This rule was introduced in ESLint 0.1.0.

Resources

• Rule source
• Documentation source