check if string contains url anywhere in string using javascript

Question

I want to check if string contains a url using javascript i got this code from google

        if(new RegExp("[a-zA-Z\d]+://(\w+:\w+@)?([a-zA-Z\d.-]+\.[A-Za-z]{2,4})(:\d+)?(/.*)?").test(status_text)) {
          alert("url inside");
        }

But this one works only for the url like "http://www.google.com" and "http://google.com" but it doesnt work for "www.google.com" .Also i want to extract that url from string so i can process that url.

possible duplicate of What is the best regular expression to check if a string is a valid URL? — user123444555621
– user123444555621, Commented May 13, 2012 at 8:50
@Pumbaa80 : No my question is little different, My input could have plain string, only url, or both text and url together. — Amit Patil
– Amit Patil, Commented May 18, 2012 at 13:00

Sudhir Bastakoti · Accepted Answer · 2012-05-13 08:44:57Z

26

Try:

if(new RegExp("([a-zA-Z0-9]+://)?([a-zA-Z0-9_]+:[a-zA-Z0-9_]+@)?([a-zA-Z0-9.-]+\\.[A-Za-z]{2,4})(:[0-9]+)?(/.*)?").test(status_text)) {
        alert("url inside");
}

answered May 13, 2012 at 8:44

Sudhir Bastakoti

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4 Comments

Amit Patil Over a year ago

This one works, But i am trying to check it once its compltely typed i mean...when i type "go" this condition satisfies and shows alert...i want this script to wait until user enters complete url and then only show alert...by the way i m using keyup event to check.

yjshen Over a year ago

@AmitPatil use blur event of the textbox, instead of keyup, sudhir's answer seems not extract that url, btw.

Sudhir Bastakoti Over a year ago

you can use blur event, so that once focus is lost from the textbox you can runs the code...

Amit Patil Over a year ago

Yes thats the trick i can think of at last, but the reason i want it on keyup event is that...whenever i detect url i want to fire ajax call to extract details of the url in the meantime user can continue his typing...like it works on facebook status

N Klosterman · Accepted Answer · 2014-10-13 16:54:57Z

3

Sudhir's answer (for me) matches past the end of the url.

Here is my regex to prevent matching past the end of the url.

var str = " some text http://www.loopdeloop.org/index.html aussie bi-monthly animation challenge site."
var urlRE= new RegExp("([a-zA-Z0-9]+://)?([a-zA-Z0-9_]+:[a-zA-Z0-9_]+@)?([a-zA-Z0-9.-]+\\.[A-Za-z]{2,4})(:[0-9]+)?([^ ])+");
str.match(urlRE)

produced this output using node.js:

[ 'http://www.loopdeloop.org/index.html',
'http://',
 undefined,
'www.loopdeloop.org',
 undefined,
'l',
index: 11,
input: ' some text http://www.loopdeloop.org/index.html aussie bi-monthly animation challenge site.' ]

answered Oct 13, 2014 at 16:54

N Klosterman

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Comments

Jesse Proulx · Accepted Answer · 2012-05-13 08:44:44Z

1

You can modify the regex to conditionally match on the scheme of the URL, like so:

var urlCheck = new RegExp('([a-zA-Z\d]+://)?(\w+:\w+@)?([a-zA-Z\d.-]+\.[A-Za-z]{2,4})(:\d+)?(/.*)?', 'i')
if (urlCheck.test(status_text) {
    console.log(urlCheck.exec(status_text));
}

answered May 13, 2012 at 8:44

Jesse Proulx

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Comments

yjshen · Accepted Answer · 2012-05-13 08:54:23Z

1

var reg = new RegExp('([a-zA-Z\d]+://)?((\w+:\w+@)?([a-zA-Z\d.-]+\.[A-Za-z]{2,4})(:\d+)?(/.*)?)', 'i')
if (reg.test(status_text)) {
    alert(reg.exec(status_text)[2]);
}

answered May 13, 2012 at 8:54

yjshen

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Comments

Netorica · Accepted Answer · 2012-05-13 08:40:56Z

0

try this one

(?<http>(http:[/][/]|www.)([a-z]|[A-Z]|[0-9]|[/.]|[~])*)

answered May 13, 2012 at 8:40

Netorica

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1 Comment

YMMD Over a year ago

I don't think that matching the www seperately is really necessary here.

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