JavaScript RegEx to change a string

Question

I need to take strings in the following format:

http:\/\/img.mypath.net\/time\/daily\/2010\/1006\/my_image_name.jpg

And convert them to this, using JavaScript:

http://www.mynewpath.com/i/daily/2010/1006/77_my_image_name.jpeg

I'm sure that someone more fluent in RegEx than I can give a terse solution.

So the "V" turns intto "/" and the "W" turns into "www" right? — Kris Krause
– Kris Krause, Commented Jul 6, 2010 at 17:07
that's \/\/ not W. Though it does look like the domain should change from "img.mypath.net" to "www.mynewpath.com" - again, a straight replace can do that. — Peter Boughton
– Peter Boughton, Commented Jul 6, 2010 at 17:13
Where does the 77 come from? Also, do you have literal backslash characters in your data or not? Because a JavaScript string literal containing "\/" is the same as one containing "/". — Antal Spector-Zabusky
– Antal Spector-Zabusky, Commented Jul 6, 2010 at 17:14
I've just edited to convert both to code format (prefix with four spaces, or quote with backticks), to make characters clear. At the same time I removed double quotes, which I assume were not needed, but noting here in case that's relevant — Peter Boughton
– Peter Boughton, Commented Jul 6, 2010 at 17:18
I'd like to know the citeria for the 77 before giving a reasonable answer. — BalusC
– BalusC, Commented Jul 6, 2010 at 17:19

BalusC · Accepted Answer · 2010-07-06 17:37:09Z

4

How about this?

var url = 'http:\/\/img.mypath.net\/time\/daily\/2010\/1006\/my_image_name.jpg';    
url = url.replace('\\/', '/'); // Replace \/ by /
url = url.replace('img.mypath.net/time', 'www.mynewpath.com/i'); // Replace domain and first path.
url = url.replace(/([^/]+)$/g, '77_$1'); // Prefix last path with `77_` (???)
alert(url);

The requirement around 77 is unclear, but if it's fixed, the above should do.

edited Jul 6, 2010 at 17:37

answered Jul 6, 2010 at 17:07

BalusC

1.1m377 gold badges3.7k silver badges3.6k bronze badges

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

7 Comments

jerome Over a year ago

There are more differences between the two URLs than simply the escaped backslashes. Thanks, though.

Peter Boughton Over a year ago

Your final regex can simply be [^/]+$ with 77_$0 in the replacement side.

BalusC Over a year ago

@jerome: That wasn't obvious in the original question. I updated my answer. @Peter: that's indeed better.

Peter Boughton Over a year ago

(This comment editing can get confusing... wish SO did some form of notification.) :)

jerome Over a year ago

@BalusC You've been a great help so far, but running the code above alerts the following. mynewpath.com/i/daily/2010/1006/77_$0

|

Collectives™ on Stack Overflow

JavaScript RegEx to change a string

1 Answer 1

7 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

7 Comments

Your Answer

Sign up or log in

Post as a guest

Related