JS.TS.PREFER.REGEXP.EXEC
Enforce that 'RegExp#exec' is used instead of 'String#match' if no global flag is provided
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 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()
.
RegExp#exec
may also be slightly faster than String#match
; this is the reason to choose it as the preferred usage.
Examples of code for this rule:
<!--tabs-->
Incorrect
Copy
'something'.match(/thing/);
'some things are just things'.match(/thing/);
const text = 'something';
const search = /thing/;
text.match(search);
Correct
Copy
/thing/.exec('something');
'some things are just things'.match(/thing/g);
const text = 'something';
const search = /thing/;
search.exec(text);
Options
Copy
// .eslintrc.json
{
"rules": {
"@typescript-eslint/prefer-regexp-exec": "warn"
}
}
This rule is not configurable.
When Not To Use It
If you prefer consistent use of String#match
for both, with g
flag and without it, you can turn this rule off.