How to replace multiple characters at a time in a string

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Can anyone tell me how to replace multiple characters at a time in a string

Eg: codeproject@discussion.com

How to replace all 'o's with 'e's and all 'e's with 'o's.

Is it possible using replaceAll() function of String class ? or for loop is needed?

What I have tried:

I have tried using replaceAll() function , but I can replace only one character at a time

Posted 13-Dec-19 19:41pm

radhikay

Updated 13-Dec-19 23:24pm

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PIEBALDconsult · Answer 1 · 2019-12-13T20:00:00

Solution 1

Write a method to iterate the characters and do it.

Also, have a look at the entries for this:
https://www.codeproject.com/Questions/1157796/Coding-challenge-bad-word-filter

Posted 13-Dec-19 20:00pm

PIEBALDconsult

Updated 13-Dec-19 20:08pm

v2

phil.o · Answer 2 · 2019-12-13T23:24:00

The problem with replaceAll is that once you will have replaced all o's with e's, you will not be able to differentiate original e's from replaced ones.
So you have to resort to a good old iteration on characters.
One of possible ways would be to maintain a dictionary of characters to be replaced, the key being the character to replace, and the value would be the replacement char. Upon iteration over original string, if current character is in the dictionary, replace it, otherwise leave it unchanged.
As this has a strong smell of homework, I won't provde any actual code; but would be glad to help further if you can come up at least with some basic implementation.