Matching substrings between square brackets using regular expressions

Hello,
I am new at Java and have a problem with regular expressions. Let me describe the issue in 3 steps:
1.- I have an english sentence. Some words of the sentence stand between square brackets, for example "I [eat] and [sleep]"
2- I would like to match strings that are in square brackets using regular expressions (java.util.regex.*;) and here is the code I have written for the task
+Pattern findStringinSquareBrackets = Pattern.compile("\\[.*\\]");+
+     Matcher matcherOfWordInSquareBrackets = findStringinSquareBrackets.matcher("I [eat] and [sleep]");+
+//Iteration in the string+
+          while ( matcherOfWordInSquareBrackets.find() )+
+{+
+          System.out.println("Patter found! :"+ outputField.getText().substring(matcherOfWordInSquareBrackets.start(), matcherOfWordInSquareBrackets.end())+"");     +
+          }+
3- the result I have after running the code described in 2 is the following: *Patter found!: [eat] and [sleep]*
That is to say that not only words between square brackets are found but also the substring "and". And this is not what I want.
What I would like to have as a result is:
*Patter found!: [eat]*
*Patter found!: [sleep]*
That is to say I want to match only the words between the square brackets and nothing else.
Does somebody know how to do this? Any help would be great.
Best regards,
Abou

You can find the words by looping through the sentence and then return the substring within the indexes.
int start=0;
int end=0;
for(int i=0; i<string.length(); i++)
   if(string.substring(i,i+1).equals("[");
  start=i;
if(start!=0)
if(string.substring(i,i+1).equlas("]");
end=i;
return string.substring(start,end+1);
}something like that. This code will only find the firt word however. I do not know much about regex so I cannot help anymore.
Edited by: elasolova on Jun 16, 2009 6:45 AM
Edited by: elasolova on Jun 16, 2009 6:46 AM

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                ,V_EXCEPTION_LOG_ID                     EXCEPTION_LOG_ID
                ,REGEXP_SUBSTR(str,'[^|]*',1,1)         EXCEPTION_CODE
                ,REGEXP_SUBSTR(str,'[^|]+',1,2)         ATTRIBUTE_NAME
                ,'N/A'                                  SP_NAME    
                ,p_table_name
                ,USER
                ,SYSDATE
                ,REGEXP_SUBSTR(str,'[^|]+',1,3)         ATTRIBUTE_VALUE
            FROM
            SELECT
                 REGEXP_SUBSTR(P_EXCEPTION_RECORD, '([^^])+', 1,t2.COLUMN_VALUE) str
            FROM
                DUAL t1 CROSS JOIN
                        TABLE
                            CAST
                                MULTISET
                                    SELECT LEVEL
                                    FROM DUAL
                                    CONNECT BY LEVEL <= REGEXP_COUNT(P_EXCEPTION_RECORD, '([^^])+')
                                AS SYS.odciNumberList
                        ) t2
            WHERE REGEXP_SUBSTR(str,'[^|]*',1,1) IS NOT NULL
            COMMIT;
           EXCEPTION
             WHEN OTHERS THEN
             ROLLBACK;
             RAISE;
        END;
    Many Thanks,
    Arpit

    Regex's are known to be CPU intensive specially when dealing with large number of rows.
    If you have to reduce the processing time, you need to tune the Select statements.
    One suggested change could be to change the following query
    SELECT
                 REGEXP_SUBSTR(P_EXCEPTION_RECORD, '([^^])+', 1,t2.COLUMN_VALUE) str
            FROM
                DUAL t1 CROSS JOIN
                        TABLE
                            CAST
                                MULTISET
                                    SELECT LEVEL
                                    FROM DUAL
                                    CONNECT BY LEVEL <= REGEXP_COUNT(P_EXCEPTION_RECORD, '([^^])+')
                                AS SYS.odciNumberList
                        ) t2
    to
    SELECT REGEXP_SUBSTR(P_EXCEPTION_RECORD, '([^^])+', 1,level) str
    FROM DUAL
    CONNECT BY LEVEL <= REGEXP_COUNT(P_EXCEPTION_RECORD, '([^^])+')
    Before looking for any performance benefit, you need to ensure that this does not change your output.
    How many substrings are you expecting in the P_EXCEPTION_RECORD? If less than 5, it will be better to opt for SUBSTR and INSTR combination as it might work well with the number of records you are working with. Only trouble is, you will have to write different SUBSTR and INSTR statements for each column to be fetched.
    How are you calling this procedure? Is it not possible to work with Collections? Delimited strings are not a very good option as it requires splitting of the data every time you need to refer to.

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