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Editorial Team
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Asked: 2026-06-16T04:34:32+00:00

I’m having a hard time figuring this one out, so I ask for your

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I’m having a hard time figuring this one out, so I ask for your help. Here’s the deal:

String str = "02-EST-WHATEVER-099-00.dwg";
String newStr = str.replaceAll("([^-_\\.]+-[^-_\\.]+-[^-_\\.]+-[^-_\\.]+-)[^-_\\.]+(\\.[^-_\\.]+)", "$1$2");

The block of code above results in 02-EST-WHATEVER-099-.dwg (removed the last “00”, just before the extension). Great, that’s what I need!

But the RegEx I use above has to be created on the fly (the field I’m removing can be in a different position). So I used some code to create the RegEx string (here’s what the result would look like if I just declared it):

String regexRemoveRev = "([^-_\\.]+-[^-_\\.]+-[^-_\\.]+-[^-_\\.]+-)[^-_\\.]+(\\.[^-_\\.]+)";

Now, if I out.print(regexRemoveRev), I get ([^-_\.]+-[^-_\.]+-[^-_\.]+-[^-_\.]+-)[^-_\.]+(\.[^-_\.]+) (notice the single backslashes).

And when i try the replaceAll again, it doesn’t work: 

String str = "02-EST-WHATEVER-099-00.dwg";
String newStr = str.replaceAll(regexRemoveRev, "$1$2");

So I thought it could be because of the single backslashes, and I tried declaring regexRemoveRev with 4 of them, instead of just 2:

String regexRemoveRev = "([^-_\\\\.]+-[^-_\\\\.]+-[^-_\\\\.]+-[^-_\\\\.]+-)[^-_\\\\.]+(\\\\.[^-_\\\\.]+)";

The output of out.print(regexRemoveRev) is the double backslash version of the RegEx, as expected:

([^-_\\.]+-[^-_\\.]+-[^-_\\.]+-[^-_\\.]+-)[^-_\\.]+(\\.[^-_\\.]+)

But the replace still doesn’t work!

How do I get this to do what I want?

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1 Answer

  1. Editorial Team

    I have just wrote a short program and in both cases it works here it is: 

    public class StringTest 
{  

    public static void main(String[] args) 
    {  
        String str = "02-EST-WHATEVER-099-00.dwg";

        String newStr = str.replaceAll("([^-_\\.]+-[^-_\\.]+-[^-_\\.]+-[^-_\\.]+-)[^-_\\.]+(\\.[^-_\\.]+)", "$1$2");

        String regexRemoveRev = "([^-_\\.]+-[^-_\\.]+-[^-_\\.]+-[^-_\\.]+-)[^-_\\.]+(\\.[^-_\\.]+)";

        String newStr1 = str.replaceAll(regexRemoveRev, "$1$2");

        System.out.println("newStr: "+newStr);
        System.out.println("regexRemoveRev: "+regexRemoveRev);
        System.out.println("newStr: "+newStr1);

    }  
}

    The out put from the above:

    newStr: 02-EST-WHATEVER-099-.dwg
    regexRemoveRev: ([^-.]+-[^-.]+-[^-.]+-[^-.]+-)[^-.]+(.[^-.]+)
    newStr: 02-EST-WHATEVER-099-.dwg

    I am not sure why is not working for you!! or is it something else you are asking and I got wrong

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