Disallow Controls Characters in Regular Expressions (no-control-regex)
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 is aimed at ensuring all regular expressions don’t use control characters.
The following patterns are considered problems:
/*eslint no-control-regex: 2*/
var pattern1 = /\\x1f/;
var pattern2 = new RegExp("\x1f"); /*error Unexpected control character in regular expression.*/
The following patterns do not cause a warning:
/*eslint no-control-regex: 2*/
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
Version
This rule was introduced in ESLint 0.1.0.