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URL

URL regular expressions can be used to verify if a string has a valid URL format as well as to extract an URL from a string.

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URL regex that starts with HTTP or HTTPS

HTTP and HTTPS URLs that start with protocol can be validated using the following regular expression

"^https?:\\/\\/(?:www\\.)?[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)$"

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Example code in Python:

import re

# Validate URL
url_pattern = "^https?:\\/\\/(?:www\\.)?[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)$"
re.match(url_pattern, 'https://uibakery.io') # Returns Match object
re.match(url_pattern, 'https:/uibakery.io') # Returns None

# Extract URL from a string
url_extract_pattern = "https?:\\/\\/(?:www\\.)?[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)"
re.findall(url_extract_pattern, 'You can view more details at https://uibakery.io or just ping via email.') # returns ['https://uibakery.io']

URL regex that doesn’t start with HTTP or HTTPS

The regular expression to validate URL without protocol is very similar:

"^[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)$"

Test it!
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True

False

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Example code in Python:

# Validate URL without protocol
url_pattern = "^[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)$"
re.match(url_pattern, 'uibakery.io/contact') # Returns Match object
re.match(url_pattern, '/uibakery.io') # Returns None

# Extract URL without prrotocol from a string
url_extract_pattern = "[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)"
re.findall(url_extract_pattern, 'You can view more details at uibakery.io or just ping via email.') # returns ['uibakery.io']

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True

False

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Notes on URL validation

The above-mentioned regular expressions only cover the most commonly used types of URLs with domain names. If you have some more complex cases you might need a different solution.