Simple extraction of text

Question

hello,
i want 2 extract some data from a text file. an example is this:
ISBN ################## 0760049602.
# means any number of blank spaces
the problem is that there can be any number of blank chars between
the "isbn" and the actual no which is unreliable can be 1space,
2space etc.. it normally gives atleast 7 space chars and so the program
cannot/does not extract the isbn no. here is the code:
int end=0;
while(end >= 0){
int begin = read.indexOf("ISBN",end);
if (begin >= 0){ begin++;
end = read.indexOf('.',begin);
if(end >= 0){
String ISBNresult = read.substring(begin,end);
isbnVector.add(ISBNresult);
else {end = -1;}
the above code does not return any isbn nos.
pls can some one help as i need to extract the isbn numbers...
i know you can use the trim method in java BUT DO NOT KNOW WHERE TO USE IT AS I AM NEW TO JAVA.
THANKS FOR UR TIME AND HELP

Answer 1

thanks balusC BUT IT IS MORE COMPLEX..
there is not only one isbn there can be several, thus i have a loop which goes through line by line:
int end=0;
              while(end >= 0){
               int begin=0, movePosition=0;
                        begin = read.indexOf("ISBN:",end); //find the index of isbn
                        movePosition=5;
                        if(begin == -1){
                 begin = read.indexOf("ISBN",end); //find the index of isbn
                 movePosition=4;
               if (begin >= 0){ //if the index is greater then 0 then increment
                   begin++;
                   end = read.indexOf(',',begin);//find the index of the comma and using substring extract the string
                            if(end == -1){
                    end = read.indexOf('.',begin);                              
                            //if no isbn exist then add the value null to the vector
                            if(end == -1){
                                isbnVector.add("null");
                   if(end >= 0){
                    String ISBNresult = read.substring(begin+movePosition,end);
                    isbnVector.add(ISBNresult); //add the results to the vector v
               else {end = -1;}
              }i dont know where to use trim over here,
pls help