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docs(eslint-plugin): update justification for prefer-regexp-exec #3392

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May 15, 2021
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docs(eslint-plugin): update justification for prefer-regexp-exec #3392

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docs: update justification for `prefer-regexp-exec` (#3389, #2280)
rrthomas May 15, 2021
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Merge branch 'master' into master
bradzacher May 15, 2021
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8 changes: 3 additions & 5 deletions packages/eslint-plugin/docs/rules/prefer-regexp-exec.md
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# Enforce that `RegExp#exec` is used instead of `String#match` if no global flag is provided (`prefer-regexp-exec`)

`RegExp#exec` is faster than `String#match` and both work the same when not using the `/g` flag.
As `String#match` is defined to be the same as `RegExp#exec` when the regular expression does not include the `g` flag, prefer a consistent usage.

## Rule Details

This rule is aimed at enforcing the more performant way of applying regular expressions on strings.
This rule is aimed at enforcing a consistent way to apply regular expressions to strings.

From [`String#match` on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match):

> If the regular expression does not include the g flag, returns the same result as `RegExp.exec()`.

From [Stack Overflow](https://stackoverflow.com/questions/9214754/what-is-the-difference-between-regexp-s-exec-function-and-string-s-match-fun)

> `RegExp.prototype.exec` is a lot faster than `String.prototype.match`, but that’s because they are not exactly the same thing, they are different.
`RegExp#exec` may also be slightly faster than `String#match`; this is the reason to choose it as the preferred usage.

Examples of **incorrect** code for this rule:

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