Regular expression matching http in javascript

Question

I am trying to write a regular expression to return true for the following cases:

http://anything
http:///anything (It can have any number of "/")

But, it should return false for the following cases:

http://
http:/
http:
http
htt
ht
h
http:/// (It can have any number of "/")

I tried the following, but it fails in some cases. Can anyone give some pointers.

(/^(f|ht)tps?:\/\//i.test(jQuery("base").attr("href")

anubhava · Accepted Answer · 2015-09-01 21:26:12Z

4

You can use this regex:

^(?:f|ht)tps?:\/{2,}[^\/].*

\/{2,} will match 2 or more / in your input.
[^\/].* after \/{2,} will make sure that input doesn't end with http:// or https:///.

RegEx Demo

edited Sep 1, 2015 at 21:26

answered Sep 1, 2015 at 20:54

anubhava

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2 Comments

anubhava Over a year ago

You're right. Check my updated answer and demo link.

user2284140 Over a year ago

Thanks a ton !!! works like a charm and thanks for the explanations for better understanding !!!

wolfhammer · Accepted Answer · 2015-09-01 21:21:53Z

0

var input = document.getElementById("input");
var output = document.getElementById("output");

var re = new RegExp("http://+[^/\\s][^\\s]*","g");

// To test a single do
// re.test(string)

output.innerHTML = input.innerHTML.match(re).join("\n");

#output {
  background-color:#EEF5F9;
  padding:10px;
}
h2 {
  margin:0;
  padding:0;
  font-size:medium;
  font-family:sans-serif;
}
pre {
  margin:0;
  padding:0 10px 0 0;
}

<h2>Inputs</h2>
<pre id="input">
    http://foo
    http:///bar
    http://foo-bar/baz
    http://
    http:/
    http:
    http
    htt
    ht
    h
    http:/// (It can have any number of "/")
</pre>

<h2>Matched</h2>
<pre id="output"></pre>

answered Sep 1, 2015 at 21:21

wolfhammer

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