conditional replaceAll java

Question

I have html code with img src tags pointing to urls. Some have mysite.com/myimage.png as src others have mysite.com/1234/12/12/myimage.png. I want to replace these urls with a cache file path. Im looking for something like this.

String website = "mysite.com"    
String text = webContent.replaceAll(website+ "\\d{4}\\/\\d{2}\\/\\d{2}", String.valueOf(cacheDir));

This code however does not work when the url does not have the extra date stamp at the end. Does anyone know how i might achieve this? Thanks!

Answer 1

Try this one

mysite\.com/(\d{4}/\d{2}/\d{2}/)?

here ? means zero or more occurance

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Note: use escape character \. for dot match because .(dot) is already used in regex

Sample code :

String[] webContents = new String[] { "mysite.com/myimage.png",
        "mysite.com/1234/12/12/myimage.png" };

for (String webContent : webContents) {
    String text = webContent.replaceAll("mysite\\.com/(\\d{4}/\\d{2}/\\d{2}/)?",
            String.valueOf("mysite.com/abc/"));
    System.out.println(text);
}

output:

mysite.com/abc/myimage.png
mysite.com/abc/myimage.png