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Java regex

Posted on 2008-11-02
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Last Modified: 2013-11-23
Well, replacement and pattern are two different strings.

String replacement = "AAA mmmm.nnn?ooo=45302 EEEEEE FFFFF GGGGGG";
String pattern =  "KLDKFVN FDFJDVmmmm.nnn?ooo=9876ERFVS";

However, they both have a similar pattern which is mmmm.nnn?ooo equal to a number. My question is asking how to get the number (9876) from the string pattern and replace the number (45302) of the string replacement i.e. to change the string replacement number (45302)  to 9876. Then the new string should be AAA mmmm.nnn?ooo=9876 EEEEEE FFFFF GGGGGG.

The regex = "mmmm.nnn\\?ooo=[0-9]+" can get the first step right to yield mmmm.nnn?ooo=9876 from the string pattern. The next step is we need to do substitution. How can we replace the mmmm.nnn?ooo=45302 from the string replacement with mmmm.nnn?ooo=9876 in order to have a new string AAA mmmm.nnn?ooo=9876 EEEEEE FFFFF GGGGGG.

Hope my question is more clear for you :)

More detail can be found from the link provided below.

http://www.experts-exchange.com/Programming/Languages/Java/New_to_Java/Q_23868181.html#a22862269
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Question by:bin571
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Accepted Solution

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Kevin Cross earned 1000 total points
ID: 22862542
This should handle that:
String replacement = "AAA mmmm.nnn?ooo=45302 EEEEEE FFFFF GGGGGG";
        String pattern =  "KLDKFVN FDFJDVmmmm.nnn?ooo=9876ERFVS";
             
        Pattern p = Pattern.compile("mmmm.nnn\\?ooo=[0-9]+"); 
        Matcher m = p.matcher(pattern);
        if (m.find()) {
            String s = m.group();
            // JOptionPane.showMessageDialog(null, s);
            m = Pattern.compile("mmmm.nnn\\?ooo=[0-9]+").matcher(replacement);
            
            if (m.find()) {
               // JOptionPane.showMessageDialog(null, m.group());
               replacement = m.replaceAll(s);
            }
JOptionPane.showMessageDialog(null, replacement);
}

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Author Comment

by:bin571
ID: 22862856
Excellent!!! Thanks a lot!!!
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LVL 60

Expert Comment

by:Kevin Cross
ID: 22862893
You are welcome!
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Author Comment

by:bin571
ID: 22863463
Hello mwvisa1, I am very sorry to bother you again. Please give me a hand.

If the pattern replacement = "AAA mmmm.nnn?ooo=45302 EEEEEE FFFFF GGGGGG" changes to
"AAA mmmm.nnn?ooo=9877 EEEEEE FFFFF GGGGGG", it is possible to do that?

PS: 9877 = 9876 + 1 (String pattern =  "KLDKFVN FDFJDVmmmm.nnn?ooo=9876ERFVS";)
In other words, I want the new pattern always plus one from the matching pattern. Please help!!!

My thought is using substring to get the value of 9876 from mmmm.nnn?ooo=9876, convert the string 9876 to integer and plus 1. Then we have mmmm.nnn?ooo=9877. But I don't how to replace this back to the string replacement :(
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LVL 60

Expert Comment

by:Kevin Cross
ID: 22863522
See my notes in code.

String replacement = "AAA mmmm.nnn?ooo=45302 EEEEEE FFFFF GGGGGG";
        String pattern =  "KLDKFVN FDFJDVmmmm.nnn?ooo=9876ERFVS";
             
        Pattern p = Pattern.compile("mmmm.nnn\\?ooo=[0-9]+"); 
        Matcher m = p.matcher(pattern);
        if (m.find()) {
            String s = m.group();
// INSERT NEW CODE HERE
// SUBSTRING LEFT OF = AND CONCATENATE WITH RIGHT OF EQUAL AFTER YOU ADD 1 TO IT AS A NUMBER
            // JOptionPane.showMessageDialog(null, s);
            m = Pattern.compile("mmmm.nnn\\?ooo=[0-9]+").matcher(replacement);
            
            if (m.find()) {
               // JOptionPane.showMessageDialog(null, m.group());
               replacement = m.replaceAll(s);
            }
JOptionPane.showMessageDialog(null, replacement);
}

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Author Comment

by:bin571
ID: 22864129
got it. thank you very much!!!
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