What is the regex for absolute url?

The regex pattern for absolute url is `^[a-zA-Z][a-zA-Z0-9+.-]*:\/\/[^\s]+$`. This pattern validates absolute url with any protocol scheme.

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^[a-zA-Z][a-zA-Z0-9+.-]*:\\/\\/[^\s]+$/;` and test with `regex.test(yourValue)`. It returns `true` if the value matches.

How do I use this regex in Python?

In Python, use `import re; re.match(r'^[a-zA-Z][a-zA-Z0-9+.-]*:\/\/[^\s]+$', value)`. The raw string prefix (`r`) prevents Python from interpreting backslashes as escape characters.

Is this regex case-sensitive?

This pattern explicitly handles both uppercase and lowercase via the character classes. No additional flags needed.

Regex for Absolute URL

Regex Pattern

^[a-zA-Z][a-zA-Z0-9+.-]*:\/\/[^\s]+$

Absolute URL with any protocol scheme

Quick Answer

The regex pattern for absolute url is `^[a-zA-Z][a-zA-Z0-9+.-]*:\/\/[^\s]+$`. Absolute URL with any protocol scheme. This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
https://example.com	✓ Matches
ftp://files.com/path	✓ Matches
ws://socket.io:8080	✓ Matches
/relative/path	✗ No match
example.com	✗ No match
://no-scheme	✗ No match

Code Examples

javascript

const regex = /^[a-zA-Z][a-zA-Z0-9+.-]*:\\/\\/[^\s]+$/;
const isValid = regex.test(value);

python

import re
pattern = r'^[a-zA-Z][a-zA-Z0-9+.-]*:\/\/[^\s]+$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^[a-zA-Z][a-zA-Z0-9+.-]*:\/\/[^\s]+$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^[a-zA-Z][a-zA-Z0-9+.-]*:\\/\\/[^\s]+$/', $value)) {
    echo "valid";
}

java

String pattern = "^[a-zA-Z][a-zA-Z0-9+.-]*:\\/\\/[^\\s]+$";
boolean isValid = value.matches(pattern);

Frequently Asked Questions

Related Regex Patterns

Subdomain Extraction

Extracts the subdomain from a URL or domain name

Protocol Detection

Detects and captures the protocol from a URL

Port Number

Extracts port number from a URL or host string

Query Parameter

Extracts key-value pairs from URL query strings

HTTP vs HTTPS URL

Matches HTTP or HTTPS URLs and captures the protocol

Data URL

Matches data: URL scheme with optional MIME type and base64 encoding