Regex URL no numbers

Question

I want to only execute a function if the main part of the URL is NOT followed by any numbers. For example, I want the following URL to match:

http://link.com/groups

but not

http://link.com:8001/ or http://link.com:8000/?alert=true

I've gotten together the regex /link.com[^0-9]+/ but it still matches the first part of the links I don't want matched so when I have the statement:

   var link = document.URL;
   var re = /link.com[^0-9]+/;
   if (re.exec(link)){
      console.log("hello");
   }

"hello" still gets logged out. Is there a way to only execute the function if there are no numbers after the main part of the URL even if part of the URL matches?

Are you just worried about the port number, or are you worried about parameter names and/or values after the ? too? — nnnnnn
– nnnnnn, Commented Aug 4, 2016 at 4:05
I don't want any URL that has any numbers after it to get matched — MarksCode
– MarksCode, Commented Aug 4, 2016 at 4:07
Use the correct technical terms: "host name", and "port number". Anyway, your regexp is matching because : matches [^0-9]. — user663031
– user663031, Commented Aug 4, 2016 at 4:07

castletheperson · Accepted Answer · 2016-08-04 04:12:05Z

3

Use a negative lookahead (?!...)

/link\.com(?!:\d)/

var link = "http://link.com:8000/?alert=true";
var re = /link\.com(?!:\d)/;
if (re.exec(link)) {
  console.log("hello");
} else {
  console.log("no match");  
}

Regex101 Demo

edited Aug 4, 2016 at 4:12

answered Aug 4, 2016 at 4:08

castletheperson

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4 Comments

zerkms Over a year ago

@MarksCode it is allowed to use multiple different regular expressions to solve different parts of the problem.

Samuel Toh Over a year ago

@4castle interestingly http://link.com/groups doesn't get matched which I thought that expression should have since there the pattern ":\d" does not occur at all after the initial link.com bit. Any idea why?

MarksCode Over a year ago

It does get matched, you just have to get rid of the other sample strings

castletheperson Over a year ago

@SamuelToh Put the demo in global mode by adding the g modifier off to the right like this

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