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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.




Beginning of input


End of input


Word boundary


Non-word boundary


Zero or more repetitions


One or more repetitions


Zero or one repetitions


n repetitions


n or more repetitions


From n to m repetitions, inclusive

To correct this error

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

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