Simple string question

[Don LLoyd]

Haven't looked at Java in a couple of years but now I've got fix a problem
in somebody else's code and I'm hitting a wall. All I've really got to do
is take one string and strip out all occurences of "{}" (i.e. not strip out
all brackets, but all left-right pairs with no space in between).

I found documentation for String.replaceAll, but it doesn't seem to actually
exist ("Cannot resolve symbol" error at compile).

There's got to be a simple way to do this that I'm overlooking - any suggestions?

[Kunal]

Try this method:

replace(char oldChar, char newChar)

Returns a new string resulting from replacing all occurrences of oldChar
in this string with newChar.



"Don LLoyd" <don@drl2.com> wrote:
>
>Haven't looked at Java in a couple of years but now I've got fix a problem
>in somebody else's code and I'm hitting a wall. All I've really got to
do
>is take one string and strip out all occurences of "{}" (i.e. not strip
out
>all brackets, but all left-right pairs with no space in between).
>
>I found documentation for String.replaceAll, but it doesn't seem to actually
>exist ("Cannot resolve symbol" error at compile).
>
>There's got to be a simple way to do this that I'm overlooking - any suggestions?
>
>

[Moppy]

Dont know if there is a way provided already by java to do what u asked but
to create the method itself was quite quick and easy.

I think this works.

public String replaceAll(String from, String token)
{
int index = 0;
int lastindex = 0;
String rtrnStr = new String();

while(lastindex < from.length() &&
(index = from.indexOf(token, lastindex)) != -1)
{
rtrnStr += from.substring(lastindex, index);
lastindex = index+token.length();
}
rtrnStr += from.substring(lastindex, from.length());

return rtrnStr;
}

Hope was of help


"Don LLoyd" <don@drl2.com> wrote:
>
>Haven't looked at Java in a couple of years but now I've got fix a problem
>in somebody else's code and I'm hitting a wall. All I've really got to
do
>is take one string and strip out all occurences of "{}" (i.e. not strip
out
>all brackets, but all left-right pairs with no space in between).
>
>I found documentation for String.replaceAll, but it doesn't seem to actually
>exist ("Cannot resolve symbol" error at compile).
>
>There's got to be a simple way to do this that I'm overlooking - any suggestions?
>
>

[Don LLoyd]

That did it! Thanks.


"Moppy" <djavro@start.com.au> wrote:
>
>Dont know if there is a way provided already by java to do what u asked
but
>to create the method itself was quite quick and easy.
>
>I think this works.
>
>public String replaceAll(String from, String token)
>{
> int index = 0;
> int lastindex = 0;
> String rtrnStr = new String();
>
> while(lastindex < from.length() &&
> (index = from.indexOf(token, lastindex)) != -1)
> {
> rtrnStr += from.substring(lastindex, index);
> lastindex = index+token.length();
> }
> rtrnStr += from.substring(lastindex, from.length());
>
> return rtrnStr;
>}
>
>Hope was of help
>
>
>"Don LLoyd" <don@drl2.com> wrote:
>>
>>Haven't looked at Java in a couple of years but now I've got fix a problem
>>in somebody else's code and I'm hitting a wall. All I've really got to
>do
>>is take one string and strip out all occurences of "{}" (i.e. not strip
>out
>>all brackets, but all left-right pairs with no space in between).
>>
>>I found documentation for String.replaceAll, but it doesn't seem to actually
>>exist ("Cannot resolve symbol" error at compile).
>>
>>There's got to be a simple way to do this that I'm overlooking - any suggestions?
>>
>>
>

[Bryan Dollery]

There is a considerably easier way to do this, if you know regular expressions.
Start by importing the jakarta ORO libraries (you can find these on the jakarta
site

http://jakarta.apache.org/oro/index.html

Once the library (.jar) is in your classpath you need to import the relavant
bit:

import org.apache.oro.text.perl.Perl5Util;

Now you can use the Perl5Util class to do regular expression matches and
substitutions. Here we'll use the substitution method. I've written a little
method to demonstrate how to do that:

private void test() {
Perl5Util util = new Perl5Util();
String test = "This is a {}test";
test = util.substitute("s/{}//gmx", test);
if(test.equals("This is a test"))
System.out.println("Passed");
else
System.out.println("Failes");
}

The important line is the one that calls the substitute method. It contains
a regular expression that searches for the string "{}", and replaces it with
nothing. The 'gmx' bit tells it that it should do this as many times as it
finds a match in the string, that it should consider the string to contain
newline characters, and that this is an extended regular expression. However,
you needn't worry about any of that. You only need ot replace the string
'test' with your string, and remove all the other lines (except the one declaring
the util object. So, you get your substitution in two lines.

Java 1.4 has something quite similar built in, but it's unlikely that you'll
have the benefit of that, so these ORO utilities are the easiest thing you
can do here. It has the benefit of being terribly fast too.

Hope this helps

Bryan


"Don LLoyd" <don@drl2.com> wrote:
>
>That did it! Thanks.
>
>
>"Moppy" <djavro@start.com.au> wrote:
>>
>>Dont know if there is a way provided already by java to do what u asked
>but
>>to create the method itself was quite quick and easy.
>>
>>I think this works.
>>
>>public String replaceAll(String from, String token)
>>{
>> int index = 0;
>> int lastindex = 0;
>> String rtrnStr = new String();
>>
>> while(lastindex < from.length() &&
>> (index = from.indexOf(token, lastindex)) != -1)
>> {
>> rtrnStr += from.substring(lastindex, index);
>> lastindex = index+token.length();
>> }
>> rtrnStr += from.substring(lastindex, from.length());
>>
>> return rtrnStr;
>>}
>>
>>Hope was of help
>>
>>
>>"Don LLoyd" <don@drl2.com> wrote:
>>>
>>>Haven't looked at Java in a couple of years but now I've got fix a problem
>>>in somebody else's code and I'm hitting a wall. All I've really got to
>>do
>>>is take one string and strip out all occurences of "{}" (i.e. not strip
>>out
>>>all brackets, but all left-right pairs with no space in between).
>>>
>>>I found documentation for String.replaceAll, but it doesn't seem to actually
>>>exist ("Cannot resolve symbol" error at compile).
>>>
>>>There's got to be a simple way to do this that I'm overlooking - any suggestions?
>>>
>>>
>>
>