prefer-d.md

pageClass	sidebarDepth	title	description	since
rule-details	0	regexp/prefer-d	enforce using `\d`	v0.1.0

regexp/prefer-d

💼 This rule is enabled in the ✅ plugin:regexp/recommended config.

🔧 This rule is automatically fixable by the --fix CLI option.

enforce using \d

📖 Rule Details

This rule is aimed at using \d instead of [0-9] in regular expressions.

/* eslint regexp/prefer-d: "error" */

/* ✓ GOOD */
var foo = /\d/;
var foo = /\D/;

/* ✗ BAD */
var foo = /[0-9]/;
var foo = /[^0-9]/;

🔧 Options

{
  "regexp/prefer-d": [
    "error",
    {
        "insideCharacterClass": "d"
    }
  ]
}

insideCharacterClass

This option control how character class element equivalent to \d will be treated.

Note: This option does not affect character classes equivalent to \d. E.g. [\d], [0-9], and [0123456789] are unaffected. It also does not affect expression non-nested operands equivalent to \d. E.g. [\d&&x], and [\d--x] are unaffected.

• insideCharacterClass: "d" (default)

  Character class element equivalent to \d will be reported and replaced with \d.

  /* eslint regexp/prefer-d: ["error", { insideCharacterClass: "d" }] */
  
  /* ✓ GOOD */
  var foo = /[\da-z]/;
  
  /* ✗ BAD */
  var foo = /[0-9a-z]/;
  var foo = /[0-9]/;

• insideCharacterClass: "range"

  Character class element equivalent to \d will be reported and replaced with the range 0-9.

  /* eslint regexp/prefer-d: ["error", { insideCharacterClass: "range" }] */
  
  /* ✓ GOOD */
  var foo = /[0-9a-z]/;
  
  /* ✗ BAD */
  var foo = /[\da-z]/;
  var foo = /[0-9]/;
  
  /* Ignore */
  var foo = /[\d--0]/v;
  /* ✗ BAD */
  var foo = /[[\da-z]--0]/v;

• insideCharacterClass: "ignore"

  Character class element will not be reported.

  /* eslint regexp/prefer-d: ["error", { insideCharacterClass: "ignore" }] */
  
  /* ✓ GOOD */
  var foo = /[\da-z]/;
  var foo = /[0-9a-z]/;
  
  /* ✗ BAD */
  var foo = /[0-9]/;
  var foo = /[[0-9a-z]--0]/v;

🚀 Version

This rule was introduced in eslint-plugin-regexp v0.1.0

🔍 Implementation

• Rule source
• Test source