validate a URL with Javascript

hoangvu

New member
Joined
Jun 6, 2012
Messages
1,889
Points
0
The input can begin with either the text "http" or "file", so the two are grouped together with a | to show that either one or the other value is acceptable. Whether the user is getting the image off of their hard drive or off the Web, the next characters have to be "://", so that's checked for next. Note that each of the forward slashes must be escaped individually (that's what the two instances of \/ are, escaped forward slashes), because forward slashes are regular expression special characters.

After that, nearly anything goes, so \S+ is used to signify that one or more nonwhite space characters follow. Then there's another required forward slash (again escaped) to separate the domain from the file name, and then another \S+ to handle the file name.

The file name needs to end with a period and then either "gif" or "jpg". The period is escaped, and the two suffixes are grouped together to test for either.

Code:
var re = /^(file|http):\/\/\S+\/\S+ \.(gif|jpg)$/i;
After the regular expression, the modifier i is used, to allow the user input to be either upper- or lowercase. This modifier tells the regular expression not to be case-sensitive.
 

hoangvu

New member
Joined
Jun 6, 2012
Messages
1,889
Points
0
good tuts. I like JS it's client scripting and useful for my work
 
Newer threads
Replies
4
Views
3,239
Replies
12
Views
5,259
Replies
17
Views
7,781
Replies
18
Views
5,866
Replies
4
Views
2,714
Latest threads
Replies
3
Views
53
Replies
1
Views
110
Recommended threads
Replies
8
Views
4,826
Replies
2
Views
3,431

Latest postsNew threads

Referral contests

Referral link for :

Sponsors

Latest Blog ArticlesMost Viewed Threads

Popular tags

You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.

Top