How to Find If a Text Contains Url String

How to find if a text contains url string

    function replaceURLWithHTMLLinks(text)
    {
      var exp = /(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
      return text.replace(exp,"<a href='$1'>$1</a>"); 
    }

Check if text contains URL

You can use stristr()

$has_link = stristr($string, 'http://') ?: stristr($string, 'https://');

http://php.net/manual/en/function.stristr.php

Or preg_match()

preg_match('/(http|ftp|mailto)/', $string, $matches);
var_dump($matches);

https://www.php.net/manual/en/function.preg-match.php

check if string contains url anywhere in string using javascript

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");
}

How to detect if String contains url and make url clickable using javascript react js

Assuming the urlify function is working as you expect, the result should be considered an HTML string. Use dangerouslySetInnerHTML to set the inner text of the p tag.

Example:

<p dangerouslySetInnerHTML={{ __html: urlify(text) }} />

As the name suggests, this is potentially a dangerous function, but if you've full control over the content and computing the HTML tags that are generated, it's probably pretty safe.

If you've any concern over the content though then I suggest also using DOMPurify to help sanitize the text value before you process it to create the links.

How to check if string contains url anywhere in string using javascript and convert it to anchor tag

I am not sure if i understand you correctly, but do you want to have it changed live or after the form was sent? If the latter, i would try something like this:

var urlCheck = 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]+)?(/.*)?");
if(urlCheck.test(status)) {
alert("url inside");
console.log(urlCheck.exec(status)[0]);
// Here my possible solution (not tried out)
$('#status').val('<a href="http://'+urlCheck.exec(status)[0]+"' target='_blank'>the link</a>");
}

But this would also mean that you could/must check with a RegEX if the user entered http or not.

What's the best way to check if a String contains a URL in Java/Android?

Best way would be to use regular expression, something like below:

public static final String URL_REGEX = "^((https?|ftp)://|(www|ftp)\\.)?[a-z0-9-]+(\\.[a-z0-9-]+)+([/?].*)?$";

Pattern p = Pattern.compile(URL_REGEX);
Matcher m = p.matcher("example.com");//replace with string to compare
if(m.find()) {
    System.out.println("String contains URL");
}

Detect URLs in text with JavaScript

First you need a good regex that matches urls. This is hard to do. See here, here and here:

...almost anything is a valid URL. There
are some punctuation rules for
splitting it up. Absent any
punctuation, you still have a valid
URL.

Check the RFC carefully and see if you
can construct an "invalid" URL. The
rules are very flexible.

For example ::::: is a valid URL.
The path is ":::::". A pretty
stupid filename, but a valid filename.

Also, ///// is a valid URL. The
netloc ("hostname") is "". The path
is "///". Again, stupid. Also
valid. This URL normalizes to "///"
which is the equivalent.

Something like "bad://///worse/////"
is perfectly valid. Dumb but valid.

Anyway, this answer is not meant to give you the best regex but rather a proof of how to do the string wrapping inside the text, with JavaScript.

OK so lets just use this one: /(https?:\/\/[^\s]+)/g

Again, this is a bad regex. It will have many false positives. However it's good enough for this example.

function urlify(text) {  var urlRegex = /(https?:\/\/[^\s]+)/g;  return text.replace(urlRegex, function(url) {    return '<a href="' + url + '">' + url + '</a>';  })  // or alternatively  // return text.replace(urlRegex, '<a href="$1">$1</a>')}
var text = 'Find me at http://www.example.com and also at http://stackoverflow.com';var html = urlify(text);
console.log(html)

var links = document.getElementsByTagName("a");
for (var i = 0, l = links.length; i < l; i++) {  var link = links[i];  if (link.href.indexOf("stack") !== -1) {    link.click();  }}

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