Replace C colon drive to c dollar

Question

I tried to replace C:\ to C$ but it is not replace when I used replace method in Java. Is replace method does not accept C:

My string shows C:\Rad\2122\Radn and how to replace C: to C$\Rad\2122\Radn in java.

Show us your code. I suspect that this you may be facing this problem: http://stackoverflow.com/questions/12734721/string-replace-not-replacing-characters but I don't want to blindly close your question as duplicate. — Pshemo, Jan 19 '16 at 15:15

Peter Lawrey · Answer 1 · 2016-01-19T15:26:55.083

4

I would use replaceFirst, though replace should also work.

path = path.replaceFirst("C:\\\\", "C\\$");

The \ needs to escaped twice, once in the regex and also in the String.

String path = "C:\\path";
path = path.replaceFirst("C:\\\\", "C\\$");
System.out.println(path);

prints

C$path

edited Jan 19 '16 at 15:26

answered Jan 19 '16 at 15:16

Peter Lawrey

@Pshemo I missed the wanted to replace the \ – Peter Lawrey Jan 19 '16 at 15:22
1

This will throw `java.lang.IllegalArgumentException: Illegal group reference: group index is missing` because `$x` in replacement represents match from group `x`. For instance `replaceFirst("(.)a","$1$1")` will double character before `a` since `$1` is reference to match from group `1`. If we want to create `$` literal we need to escape it with `"\\$"`. – Pshemo Jan 19 '16 at 15:26

score 3 · Answer 2 · answered Jan 19 '16 at 15:20

3

Try escaping the \ character

str = str.replace("C:\\", "C$");

answered Jan 19 '16 at 15:20

Reimeus

Yes, this is the best approach. Regular expressions just add needless complexity to something that can be kept simple. – VGR Jan 19 '16 at 17:34

score 1 · Answer 3 · answered Jan 19 '16 at 15:31

1

path = "c$" + path.s.substring(2);

answered Jan 19 '16 at 15:31

sami zahwan

3 Answers3