RegEx Javascript - What am I doing wrong?

I have this pattern stored in a variable: var regexServer = /^([0-9]{2,3})+\.([0-9]{2,3})+\.([0-9]{2,3})+\.([0-9]{2,3})+\:[0-9]{2,4}$/; if(!stringFromArgument.match(regexServer)) alert("You must input a valid IP and a Port address! Eg: 66.77.88.99:8000"); I checked the string coming from the input (form), and it's ok. If somebody wants to add his own IP and Port address he must add a valid form. His string must contain only `.`, `:`, numbers and no whitespace. What am I doing wrong?
Please provide the example input you are usingthat is failing

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