noDivRegex

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JavaScript (and super languages)

Summary

Rule available since: v2.3.12
Diagnostic Category: lint/nursery/noDivRegex
This rule has a safe fix.
The default severity of this rule is information.
Sources:
- Same as no-div-regex

How to configure

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{
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  "linter": {
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    "rules": {
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      "nursery": {
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        "noDivRegex": "error"
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      }
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    }
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  }
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}

Description

Disallow equal signs explicitly at the beginning of regular expressions.

This rule forbids equal signs (=) after the slash (/) at the beginning of a regular expression literal, because the characters /= can be confused with a division assignment operator.

Examples

Invalid

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function bar() {
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  return /=foo/;
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}

code-block.js:2:10 lint/nursery/noDivRegex  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Avoid using an equal sign directly after the slash at the beginning of a regular expression literal.
  
    1 │ function bar() {
  > 2 │   return /=foo/;
      │          ^^^^^^
    3 │ }
    4 │ 
  
  ℹ The characters /= can be confused with a division assignment operator. Replace the equal sign (=) with [=] to prevent confusion.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.
  
  ℹ Safe fix: Replace with [=].
  
    2 │ ··return·/[=]foo/;
      │           + +

Valid

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function bar() {
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  return /[=]foo/;
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}