Unexpected quantifier (JavaScript)

When composing your regular expression search pattern, you created a pattern element with an illegal repetition factor. For example, the pattern


is illegal because the element ^ (beginning of input) cannot have a repetition factor. The following table lists the elements that cannot have repetition factors.

Element Description
^ Beginning of input
$ End of input
\b Word boundary
\B Non-word boundary
* Zero or more repetitions
+ One or more repetitions
? Zero or one repetitions
{n} n repetitions
{n,} n or more repetitions
{n,m} From n to m repetitions, inclusive

To correct this error

  • Ensure your search pattern element contains legal repetition factors only.

See Also

Regular Expression Object
Regular Expression Syntax (JavaScript)