Regex not passing the check

The following statement when provider[x].prefixRegExp = /^5[1-5]/ and val = 55 doesn't return true... am I doing something wrong?

if (provider[x].prefixRegExp.test(val)) {
     $('#payment-panel .credit-card-type .'+provider[x].name).addClass('selected')开发者_开发问答.attr('rel', x);
}

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/^5[1-5]/.test(55) actually does return true. Make sure that provider[x].prefixRegExp and val are as you expected by adding alert(provider[x].prefixRegExp + ' ' + val); before those lines and alert("it is true, your css or jquery selector is broken"); in the if condition.

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Just checked in browser console:

>> /^5[1-5]/.test("55")
<< true

So looks like your val not equals 55 or your provider[x].prefixRegExp not the /^5[1-5]/