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I have the following code

String rplaceString="John = Max and Jing => Sira then nothing";
String replaced=rplaceString.replace("=", "==").replace("=>", "=>");
System.out.println("REPLACE STRINF==>>>>>>>>"+replaced);

Expected Output String Like this:

String expectedString="John == Max and Jing => Sira then nothing";

If I do above method, Output Looks Like:

REPLACE STRINF==>>>>>>>>John == Max and Jing ==> Sira then nothing

So, How can replace above string in expected string.

Edit: Change String Like this: John =Max and Jing => Sira then nothing

or

John= Max and Jing =>Sira then nothing

or

John=Max and Jing => Sira then nothing

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  • 1
    what is expected output? Commented May 30, 2014 at 4:27
  • yo don't see, expected output: John == Max and Jing => Sira then nothing Commented May 30, 2014 at 4:29
  • @javanewuser Remove all the unrelated junk (that is not part of the expected/actual result) and align the output on top of each-other, and draw focus to the particular issue. In doing so you'll probably find out what the problem is. Commented May 30, 2014 at 4:30
  • You could use replaceFirst() the docs for String methods are here: docs.oracle.com/javase/6/docs/api/java/lang/String.html Commented May 30, 2014 at 4:30

3 Answers 3

Reset to default
7

A simple way to fix the issue would be to just add spaces around the = in your replace:

String replaced=rplaceString.replace(" = ", " == ")

Then you would only be matching the standalone = instead of the arrow as well.

EDIT:

More comprehensive answer:

String s = "John=Max and Jing=>Sira then nothing";

String t = s.replaceAll("(?<=.)=(?!>)"," == ");
t = t.replaceAll("=>", " => ").replaceAll("\\s+", " ");
System.out.println(t);
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6 Comments

awesome! great to hear. If you could just accept this answer I would greatly appreciate it.
wait bryan, stackoverflow takes some times for accept answers.
My bad. shouldn't get so antsy :D
Bryan, if some change string like this: John =Max and Jing => Sira then nothing ,How to do?
So let me get this straight, John =Max and Jing=> Sira then nothing is the string you want to convert into the expected output John == Max and Jing => Sira then nothing
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String rplaceString = "John = Max and Jing => Sira then nothing";
    System.out.println(rplaceString.replaceAll(" = ", " == ").replaceAll("=>", "=>"));
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If a space is always guaranteed after the = sign then you can use 

String replaced=rplaceString.replace("= ", "== ").replace("=>", "=>");

Please note that I am appending a space after the '=' sign as '= ' while replacing.

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