check format of regular expression in javascript

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Javascript

Hi All,

I have a regular expression and I want to check this regular expression is valid or not(correct format).

I try to use this code as below to check but it run not good

var regExp = new RegExp();
regExp.compile("^[\d\-]{0,64}");  => check OK.
regExp.compile("[[\d\-]{0,64}");  => check Not Good.

Please help me handle this case.

thanks in advance.