How to replace both space and newline form the string using regex

Question

 lstIQCodes = IQcodeString.replaceAll(' ','').split(','); 

I have tried the above code and able to replace spaces and now I want to replace newline as well.

Answer 1

If you just want to get rid of all the white space, you can just delete it:

lstIQCodes = IQcodeString.deleteWhitespace().split(','); 

ReplaceAll actually takes a regular expression for the first parameter, so the following is also valid:

lstIQCodes = IQcodeString.replaceAll('\\s+','').split(','); 

\\s refers to all white space, including tabs, new lines, carriage returns, and spaces.

Or, if you really just wanted spaces and newlines:

lstIQCodes = IQcodeString.replaceAll('[\\n ]+','').split(','); 

Answer 2

You can follow the same approach to remove the new lines as well

for(String lines : IQcodeString.replaceAll(' ','').split(','))
     system.debug(lines.replaceAll('\n','').replaceAll('\r','') );