Javascript : Empty String Match In Regular Expression

Question

i want to match the url with contatin http/https and (www) or without (www)with the help of regular expression. following is my regualr expression

^((https?)://)(www\\.)| ^$ +(\.[a-z0-9-]+)+([/?].*)?$

but in this, the empty string is not work for example : when i enter http://www.google.com is valid url but http://google.com is not valid. thanks for the answer in advance.

stema · Accepted Answer · 2013-06-14 07:29:05Z

1

You can't search for an not existing part using ^$. that is expecting a start of a string(row), end of the string (row).

Just make the "www" part optional:

^((https?)://)(www\\.)?(\.[a-z0-9-]+)+([/?].*)?$

another problem is, you are searching for two dots in a row:

^((https?)://)(www\\.)?(\.[a-z0-9-]+)+([/?].*)?$
                    ^    ^

I think a better pattern would be

^((https?)://)(www\\.)?([a-z0-9-]+)(\.[a-z0-9-]+)*([/?].*)?$

Are you aware, that you are excluding a lot of valid URLS, by only allowing the characters [a-z0-9-]?

answered Jun 14, 2013 at 7:29

stema

93.5k20 gold badges110 silver badges138 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Harmeet Singh Taara Over a year ago

thanks for this , but i want to restricted (www) only ,in this the other character also accept like 'sss'

stema Over a year ago

How to you want to know to what part of the domain the character sequence belongs? e.g. http://www.sss.com versus http://sss.com?

Harmeet Singh Taara Over a year ago

so @stema what i do, or please give me another regular expression , which validate all valid url.

stema Over a year ago

see What is the best regular expression to check if a string is a valid URL?

Collectives™ on Stack Overflow

Javascript : Empty String Match In Regular Expression

1 Answer 1

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related