Regular Expression for Windows Restricted Words

Question

如何编写正则表达式来捕获Windows限制名称，如COM1或COM2或COM9（COM1或COM2或COM3 ....或COM9）。

Answer 1

Because Windows filenames are not case sensitive you should don't forget the CASE_INSENSITIVE flag:

Pattern regex = Pattern.compile("CON|PRN|AUX|NUL|(COM|LPT)[1-9]", Pattern.CASE_INSENSITIVE);

For anyone who's interested - here is the MSDN link to the documentation of the Windows naming conventions: Naming Files, Paths, and Namespaces

Answer 2

Found the answer,

Pattern p= Pattern.compile("abc");
p.matcher("").matches();