URL regular expression [duplicate] - regex

Question

This question already has answers here:
What is the best regular expression to check if a string is a valid URL?
(62 answers)
Closed 9 years ago.
i am writing a regular expression to check a website URL it should check the following scenarios:
pass:
- www.example.com
- example.com
- www.example.com/something
- example.com/something
and prevent every other urls
its working perfectly for every thing except one case (www.example), how can i handel this case
"www.example" must not pass
my regular expression :
^[a-zA-Z0-9][a-zA-Z0-9]+([.][a-zA-Z0-9]+)+(/.*)?$
can any one help please ?
Thanx.

Answer 1

Heres the best i could get
(www.){1}[a-zA-Z0-9]+[.]{1}[\w]+[/\w]*
Result
www.example.com - true
www.example.com/ - true
www.example.com/xyx - true
www.example.com/xy/s/ - true
www.example. - False
www.example - False
please note that this wont accept 'example.com'
Tested # http://gskinner.com/RegExr/

Answer 2

Try this one:
^(www\.)?(?!www)[a-zA-Z0-9]+\.[a-zA-Z]{2,6}/?[a-zA-Z0-9]+$

Answer 3

This is the actual URL validating regex used in Django 1.5.1:
import re
regex = re.compile(
r'^(?:http|ftp)s?://' # http:// or https://
r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|' # domain...
r'localhost|' # localhost...
r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}|' # ...or ipv4
r'\[?[A-F0-9]*:[A-F0-9:]+\]?)' # ...or ipv6
r'(?::\d+)?' # optional port
r'(?:/?|[/?]\S+)$', re.IGNORECASE)
This does both ipv4 and ipv6 addresses as well as GET parameters.
Found in the code here, Line 44.

Answer 4

Try this:
_^(?:(?:https?|ftp)://)(?:\S+(?::\S*)?#)?(?:(?!10(?:\.\d{1,3}){3})(?!127(?:\.\d{1,3}){3})(?!169\.254(?:\.\d{1,3}){2})(?!192\.168(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{00a1}-\x{ffff}]{2,})))(?::\d{2,5})?(?:/[^\s]*)?$_iuS
I can't claim credit though; I yanked it from here:
http://mathiasbynens.be/demo/url-regex
They've got a reasonable chart with lots of expressions with pass/fail for each case against each expression.

Answer 5

Not the best regex but works in many cases:
^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}(/.*)*$
Edit:
^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+(com|org|info|biz|us)/?([^/]*)$
To allow trailing slash:
^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+(com|org|info|biz|us)/?([^/]*)/?$