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JavaScript error

SyntaxError

The JavaScript exception "numbers out of order in {} quantifier" occurs when a quantifier in a regular expression uses the {n,m} syntax but m is less than n.

Reference entryJavaScriptFetched
This is a reference entry from MDN Web Docs. A full explanation with fixes has not been written yet.

The error messages

SyntaxError: Invalid regular expression: /1{2,1}/: numbers out of order in {} quantifier (V8-based)
As listed by MDN Web Docs
SyntaxError: numbers out of order in {} quantifier. (Firefox)
As listed by MDN Web Docs
SyntaxError: Invalid regular expression: numbers out of order in {} quantifier (Safari)
As listed by MDN Web Docs

Details

Category
SyntaxError
Severity
error
Runtime
both

Related errors

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Source: MDN Web Docs. Data fetched 2026-09-25T01:48:37.274Z.