Regular expression to truncate a String

Posted by user470184 on Stack Overflow See other posts from Stack Overflow or by user470184
Published on 2012-12-20T10:44:52Z Indexed on 2012/12/20 11:03 UTC
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To truncate a String here is what I'm using :

String test1 = "this is test truncation 1.pdf";     
String p1 = test1.substring(0, 10) + "...";
System.out.println(p1);

The output is 'this is te...' How can I access the file name extension so that output becomes : 'this is te... pdf' I could use substring method to access the last three characters but other file extensions could be 4 chars in length such as .aspx

Is there a regular expression I can use so that "this is test truncation 1.pdf" becomes "this is te... pdf"

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