Regular expressions jsp

I am trying to replace encoded http%3A%2F%2F with http:// in a string using regular expressions in a jsp...
Not much luck so far, it replaces the first occurrence but the second one is replaced OK, but ":" column is missing...
So the second occurrence became http//.
I actually don't need to replace the second occurrence, but only the first one.
My string always starts with http%3A%2F%2F.
What is the correct regex and replacement for this using regular expressions?
 Basically i need
http%3A%2F%2F become http:// only ones.
Thank you.
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ZvonkoSystems architectCommented:
The normal behaviour is that repalce methods do replace oncce when NOT searching by RegExp.
So look for your <cas:replace what the contepart for regex= keyword is and you are done. Then you need something like this:

<cas:replace  search="http%3A%2F%2F" replacement="http://"/>

I did not found cas tag library description, but I assume it is something like:

<cas:replace  if="http%3A%2F%2F" replacement="http://" />

why don't you just decode the string?
if u want to use regexp try something like:

s = s.replaceAll("%3A", ":").replaceAll("%2F", "/");
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I am not sure if I understand your problem clearly...

String str = "http%3A%2F%2F"
str = str.replaceAll( str, "http://" )
yes, as objects said, decoding the string would resolve the problem and that is the standard way too!
olenadmytrenkoAuthor Commented:
The thing is that string must be encoded for some rating purposes.
I need to decode  http:// because if the string starts with encoded value
which is used in an ancor (a href=""), then the whole url is treated as  relative..
So if http:// is http%3A%2F%2F, then there is http://localhost:8080 is appended infront of my  encoded http://

Basically  I have a custom tag which can replace substrings based on regular expressions, like
<cas:replace regex="http%3A%2F%2F" replacement="http://"/>
so I thought I'll use it, it does everything ok, except I am not sure about the string in replacement part, coz it accpets regular expressions and I am rubbish with them.
If it all sounds too complicated then I could use just java string relpace....
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