JRegexpTester needs :
You can verify if a jvm 1.4 is installed typing in a console : java -version
C:\>java -version java version "1.4.2" Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28) Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)
You must verify also if the java compilator is installed. The java compilator is included into the J2SE SDK.
C:\>javac -help Usage: javac ... where possible options include: ...
You can download a free complete jvm from the : sun java download page
The three above are good
Very important :
Since the release 0.3, you need the J2SE SDK if you want to compile the filters ('Split').