RegEx Javascript-我在做什么错？

Question

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?

Answer 1

Whats your problem?

I see two things

/^([0-9]{2,3})+\.([0-9]{2,3})+\.([0-9]{2,3})+\.([0-9]{2,3})+\:[0-9]{2,4}$/
              ^              ^              ^              ^
                                                            ^

• The quantifiers in my first row of markers are wrong.
• The escaping marked in the second row is not needed, since ":" is not a special character.

Answer 2

您接受的IP编号从10到255，也许您应该将量词从{2,3}更改为{1,3}，否则IP地址（例如128.0.0.1:80）将被拒绝。

Answer 3

I think your RegExp isn't working because the + characters.

This should work and is in my opinion a more efficient regular expression: /^([0-9]{1,3}(\\.?)){4}:[0-9]{2,5}$/

You should allow 1 number for each level. For example: 82.176.103.6 wouldn't match if you didn't. Also, the amount of numbers for ports should be 5 because the highest port number is 65535

Answer 4

First, no need put (…)+ if you just testing. Also you've limited 3rd and 4th numbers to 2+, but there could be numbers lower than 10 as well as the port could be greater than 9999.

var regexServer = /^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\:[0-9]{2,4}$/

Also, this regex only checks if correct format, but not validating the ip (checks if the numbers is between 0-255). Here is some more regex (without the port check, you can add it by your self):

var regexServer = /^(([2]([0-4][0-9]|[5][0-5])|[0-1]?[0-9]?[0-9])[.]){3}(([2]([0-4][0-9]|[5][0-5])|[0-1]?[0-9]?[0-9]))$/