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
Zero or more repetitions
One or more repetitions
Zero or one 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.