String Replace

[Meet Gaurav]

Hi

Am facing a small in String Replace ALL method. Some please assist me to resolve the issue.

String url="C:\\test";
String type = "$7 d:\\test\\";
type = type.replaceAll("\\$7", url);
System.out.println(type);

Out put is : C:test d:\test\


Am expecting the url to be C\:test but it's coming as C:test

If I add String url="C:\\\\test"; then its working fine. But in my case am getting this url dynamically from another class. So I can't go for this option. Please help me.

[Meet Gaurav]

Can I try like this. This is working fine. But I guess it's a worst option.

  		String url="C:\\test";
		String type = "$1 d:\\test\\";
		
		 String newUrl = "";
		 for(int i=0; i <= url.length()-1; i++)
		 {
			 char d  = url.charAt(i);
			 if(d == '\\')
			 {
			  newUrl = newUrl+"\\\\";
			 }
			 else
			 {
			   newUrl = newUrl+d; 
			 }
		 }
		 
		type = type.replaceAll("\\$1", newUrl);
		System.out.println(type);  

[Campbell Ritchie]

Far better to use a StringBuilder for that sort of manipulation. You can iterate through the String, look for an instance of \ and insert a \\ character after it. Just make sure to increment your index after the insertion, otherwise you will get strings with look like th\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\is