替换字符串java中的几个不同字符

Question

I have a string from a file that I read and I want to remove contents of that string. An example would be like this: PN ,D2 ,R2 , F ,Di , B ,Ri ,Fi What I want to do is to remove all the commas and if there is more than one space between each 1 or two characters like R2 , F I would want to remove the extra space and comma. So far I have been able to remove some other contents in the string but can't seem to be able to remove the commas and extra spaces.

String cleanerLine = reverseLine.replaceAll("PN ,", "");
        System.out.print("Solution: " + cleanerLine);

The output is like this: Solution: D2 ,R2 , F ,Di , B ,Ri ,Fi

Answer 1

The String.replaceAll(String,String) method takes as **first argument a regular expression . So you could write something like:

String cleanerLine = reverseLine.replaceAll("PN ,","")
                                .replaceAll(",", "")
                                .replaceAll(""," ");

The " {2,}" is a regular expression that matches with all " two or more spaces ".

When reverseLine is:

String reverseLine = "PN ,D2 ,R2 , F ,Di , B ,Ri ,Fi";
System.out.println(reverseLine.replaceAll("PN ,","").replaceAll(",", "").replaceAll(" {2,}"," "));

it produces:

D2 R2 F Di B Ri Fi