How to stop java replaceAll() from removing backslash?

Question

I am writing some simple java code that looks in a string to find a value called REPLACEALL. Once it finds that string I have it replace it with a path name as a value (ex:D:\test\path\something). However, when I run the code it replace it fine but it removes the single \. I am not sure why and have set up a debug to see where it is happening. The original string gets passed in fine, its only when the string goes through the replaceAll() that it causes this issue.

Java:

String path = "D:\test\path\something"; String s1="select * from Webserver WHERE data= REPLCAEME"; String replaceString=s1.replaceAll("REPLACEME"," ' " + path + " ' "); System.out.println(replaceString);

Does this answer your question? What is the backslash character (\\‌)? — lugiorgi
– lugiorgi, Commented Feb 14, 2020 at 12:42
@BillyBrown I can't modify the string, its preset by an api and passed straight into the application to get replaced. So that's why I am having a hard time solving the issue — kane_004
– kane_004, Commented Feb 14, 2020 at 12:46
It seems you want to build up an SQL statement. In this case, this is anyhow the wrong approach. Have a look to PreparedStatement. — Henry
– Henry, Commented Feb 14, 2020 at 12:47
@kane_004 and this is exactly the use case PreparedStatements are intended to solve. They also take care of SQL injection problems. — Henry
– Henry, Commented Feb 14, 2020 at 12:53

pxcv7r · Accepted Answer · 2020-02-14 12:49:18Z

The backslash is used as an escape character in strings, which means that you have to escape it itself as \\. Otherwise, it denotes special characters, e.g., \t denotes a tab space, so in your example \test effectively means <tab>est.

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