regexPlusQuantifiers

Reports quantifiers {1,} in regular expressions that should use + instead.

✅ This rule is included in the ts stylisticStrict presets.

Reports quantifiers using {1,} in regular expressions and suggests using the more concise + quantifier instead. Both forms are semantically equivalent (matching one or more of the preceding element), but + is the idiomatic form.

Examples

Greedy Quantifier

❌ Incorrect

const pattern = /a{1,}/;

✅ Correct

const pattern = /a+/;

Lazy Quantifier

❌ Incorrect

const pattern = /a{1,}?/;

✅ Correct

const pattern = /a+?/;

Groups

❌ Incorrect

const pattern = /(ab){1,}/;

✅ Correct

const pattern = /(ab)+/;

RegExp Constructor

❌ Incorrect

const pattern = new RegExp("a{1,}");

✅ Correct

const pattern = new RegExp("a+");

Options

This rule is not configurable.

When Not To Use It

If your project has a style guide that prefers the explicit {1,} syntax for clarity, or if you are programmatically generating regular expressions where {1,} is easier to produce, you might want to disable this rule.

Further Reading

• MDN: Quantifier
• MDN: Regular expressions

Equivalents in Other Linters

• ESLint: regexp/prefer-plus-quantifier