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Splitting a string at a defined sign - especially "("

I have a little problem with splitting a String
String anl_gewerk = "Text Text Text (KG 412/2)"
String[] parts = anl_gewerk.split("[(]");
anl_gewerk = parts[1];
anl_gewerk = anl_gewerk.replaceAll("\\(","").replaceAll("\\)","");
anl_gewerk = anl_gewerk.replace("KG","");
I have the aforementioned string, and I'm searching for "412/2".
Therefore, I want to split the String into two substrings searching for "(".
Finally I want to grab this String deleting "(", "KG", " " and ")".
When I select anl_gewerk = parts[0]; it works but I get the wrong part, when I change into parts[1] the App crashes.
Please help me

Try to change your code by this:
String anl_gewerk = "Text Text Text (KG 412/2)";
String[] parts = anl_gewerk.split("[(]");
anl_gewerk = parts[1];
String sub[] = anl_gewerk.split(" ");
String test = sub[1];
String result = test.replace(")","");// it gives your result 412/2

Java, Substring to get value from string

given a string like this
string a = "Course Name:\n" + CourseName
+"\n\nVenue:\n" + locationName
+"\n\nStart Time:\n" + startTime
+"\n\nEnd Time:\n"+ endTime";
CourseName,locationName,startTime and endTime would be a variable and being assigned to string a, how can i get all these value from the string using substring or regex and store all of it into different variable? please note that I don't have access all these variable, I can only access the string which leave me the only option is play around with substring or regex.

You could split by newline
String[] parts = a.split("\\n");
String courseName = parts[1];
String locationName = parts[4];
String startTime= parts[7];
String endTime= parts[10];

or you can use:
StringTokenizer tokens=new StringTokenizer(a, "\n");
while(tokens.hasMoreTokens()){
System.out.println(tokens.nextToken());
}

how can i split a string inside curly braces?

I have a string which looks like this
[{"TransactionId":"3574780600039252015-12-24 T 14:22:03"
Now I want to split only the text where the "TransactionId" will be part one and after : will be the second part.
Code I've tried :
String[] transid_result = result.split(":");
String part1 = transid_result[0];
String part2 = transid_result[1];
The result is
part1 contains [{"TransactionId
part2 contains "3574780600039252015-12-24 T 14
I want part2 to contain "3574780600039252015-12-24 T 14:22:03"
Can anyone help me ?

You could search for the first : and manually split by that:
int firstColon = result.indexOf(":");
String part1 = result.substring(0,firstColon);
String part2 = result.substring(firstColon+1, result.length());

If you're sure the data will always be in this format, then you could use
String[] elements = result.split("\"");
String transactionId = elements[3];

String replace using replace first method

I was trying to use the string replace with another, it doesn't happen.
String requestURI = "/webapps-ab/public/Test.jsp"
String contextName = "webapps-ab";
String newRequestURI = requestURI.replaceFirst(contextName,"webapps");
I am expecting newRequestURI to be "/webapps/public/Test.jsp".

Your replace call should be:
String newRequestURI = requestURI.replaceFirst(contextName, "webapps");
Using:
String requestURI = "/webapps-ab/public/Test.jsp";
String contextName = "webapps-ab";
String newRequestURI = requestURI.replaceFirst(contextName, "webapps");
System.out.println("newRequestURI: " + newRequestURI);
The output will be what you're expecting:
newRequestURI: /webapps/public/Test.jsp
ideone example.

When referencing a variable, do not surround it in quotes, as that converts it into a literal String object.
String newRequestURI = requestURI.replaceFirst(contextName, "webapps");

Making a song name out of a URL

I have a URL and I want it to look like this:
Action Manatee - Action
http://xxxxxx.com/songs2/Music%20Promotion/Stream/Action%20Manatee%20-%20Action.mp3
What is the syntax for trimming up to where it after this "Stream/" and make spaces where the %20 is. I also want to trim the .mp3

Hmm, for that particular example, I would split the string according to the '/' character then trim the text that follows the final '.' character. Finally, do a replace of "%20" into " ". That should leave you with the string you want
Tested
String initial = "http://xxxxxx.com/songs2/Music%20Promotion/Stream/Action%20Manatee%20-%20Action.mp3";
String[] split = initial.split("/");
String output = split[split.length-1];
int length = output.lastIndexOf('.');
output = output.substring(0, length);
output = output.replace("%20", " ");

String urlParts[] = URL.split("\/");
String urlLast = urlParts[length-1];
String nameDotMp = urlLast.replaceAll("%20");
String name = nameDotMp.substring(0,nameDotMp.length-5);

You could use the split() and replace() methods to accomplish this, here are two ways:
Split your string apart by using the forward slashes:
string yourUrl = [URL Listed];
//Breaks your URL into sections on slashes
string[] sections = yourUrl.split("\/");
//Grabs the last section after the slashes, and replaces the %20 with spaces
string newString = sections[sectiongs.length-1].replace("%20"," ");
Split your string at the Stream/ section: (Only use this if you can guarantee it will be in that form)
string yourUrl = [URL Listed];
//This will get everything after Stream (your song name)
string newString = yourUrl.split("Stream\/")[1];
//Replaces your %20s with spaces
newString = newString.replace("%20"," ");

URL songURL = new URL("yourpath/filename");
String filename = songURL.getFile();