eslint/docs/src/rules/no-useless-escape.md

   1 ---
   2 title: no-useless-escape
   3 rule_type: suggestion
   4 ---
   5
   6
   7
   8
   9
  10 Escaping non-special characters in strings, template literals, and regular expressions doesn't have any effect, as demonstrated in the following example:
  11
  12 ```js
  13 let foo = "hol\a"; // > foo = "hola"
  14 let bar = `${foo}\!`; // > bar = "hola!"
  15 let baz = /\:/ // same functionality with /:/
  16 ```
  17
  18 ## Rule Details
  19
  20 This rule flags escapes that can be safely removed without changing behavior.
  21
  22 Examples of **incorrect** code for this rule:
  23
  24 ::: incorrect
  25
  26 ```js
  27 /*eslint no-useless-escape: "error"*/
  28
  29 "\'";
  30 '\"';
  31 "\#";
  32 "\e";
  33 `\"`;
  34 `\"${foo}\"`;
  35 `\#{foo}`;
  36 /\!/;
  37 /\@/;
  38 /[\[]/;
  39 /[a-z\-]/;
  40 ```
  41
  42 :::
  43
  44 Examples of **correct** code for this rule:
  45
  46 ::: correct
  47
  48 ```js
  49 /*eslint no-useless-escape: "error"*/
  50
  51 "\"";
  52 '\'';
  53 "\x12";
  54 "\u00a9";
  55 "\371";
  56 "xs\u2111";
  57 `\``;
  58 `\${${foo}}`;
  59 `$\{${foo}}`;
  60 /\\/g;
  61 /\t/g;
  62 /\w\$\*\^\./;
  63 /[[]/;
  64 /[\]]/;
  65 /[a-z-]/;
  66 ```
  67
  68 :::
  69
  70 ## When Not To Use It
  71
  72 If you don't want to be notified about unnecessary escapes, you can safely disable this rule.